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2001年高考中有一道单项选择题：
____ is known to everybody, the moon travels round the earth once every month.
A. It B. As C. That D. What
此题的答案为B, as 在这引导一个非限制性定语从句，修饰后面的内容。但有学生在做题时很困惑，不明白为什么不选A或D。这就说明他们对一些句型结构分辨不清，我们把题目做以下变化：
1.____ is known to everybody that the moon travels round the earth once every month.
2.____ is known to everybody is that the moon travels round the earth once every month.
A. It B. As C. That D. What
1题答案为A。it作形式主语，真正的主语是that引导的从句; 而2题答案为 D。what在此引导一个主语从句，它在从句当中充当主语，而后面的that引导的从句则是表语从句。
所以易混句型是广大学生学习中的一个难点，也是高考中的一个重点内容，不但在单项选择题中出现，而且在短文改错中，完形填空中也有涉及,而学生在备考过程中往往很困惑，本文作者通过对部分高考题和平时的模拟试题进行分析、研究和归纳，总结以下常见易混句型，并加以辨析，帮助学生提高成绩。
点击一：
1. It was in New Zealand ____ Elizabeth first met Mr. Smith. (2008全国)
2. It was New Zealand ____ Elizabeth first met Mr. Smith.
A. that B. how C. which D. where
辨析：1题答案为A。that 引导的是强调句型。2题答案为D。句中New Zealand 是先行词，where引导的是定语从句。
点击二：
1.It is such an interesting book ____ all of us like.
2.It is such an interesting book ____ all of us like it.
A. that B. which C. as D. when
辨析：1题答案为C。“such…as…”结构，as引导定语从句，在从句中作宾语。2题答案为A 。“such…that…”结构，that引导结果状语从句。
点击三：
1.It was 3 years ____ he came back.
2.It was 3 years ago ____ he came back.
3.It is 3 years ____ he came back.
A. since B. that C. when D. before
辨析：1题答案为D。意为“过了三年，他才回来。”It在此表时间，特别注意，主、从句时态的一致。2题答案为B。此句是强调句型，特点是可以还原成一个完整的句子，还原后的句子是：He came back 3 years ago. 3题答案为A。since表从过去到现在为止。
点击四：
1.I was told that there were about 50 foreign students ____ Chinese in the school, most ____ were from Germany. (2006辽宁)
2.I was told that there were about 50 foreign students ____ Chinese in the school, and most ____ were from Germany.
3.I was told that there were about 50 foreign students ____ Chinese in the school, most ____ from Germany.
A. study; of whomB. study; of them
C. studying; of them.D. studying; of whom
辨析：1题答案为D。第一空studing是非谓语，因为句子已经有谓语动词were, whom引导一个非限制性定语从句，起补充作用。2题答案选C。and连接两个并列句。3答案为C。为独立主格结构，起补充说明的作用。most of them与from Germany构成逻辑上的主谓关系。
点击五：
1.____ made his teacher angry.
2.____, his teacher got angry.
3.____, which made his teacher angry.
A. He being lateB. His being late
C. He was late. D. His late
辨析：1题答案为B。-ing形式复合结构His being late在句中作主语。2题答案为A 。He being late 为独立主格结构，在句中作状语。3题答案为C。为一个完整的句子，which引导非限制性定语从句修饰这个句子。
点击六:
1.It was not until 12 o’clock ____ home.
2.Not until 12 o’clock ____ home.
A. did he returnB. he returned
C. that he returnedD. that did he return
辨析：1题答案为C。为强调句式。2题答案为A。否定词提前，句子用倒装语序。
点击七：
1.____ his wife’s being there, I said nothing about it.
2.____ his wife was there, I said nothing about it.
3.____ his wife there, I said nothing about it.
A. Because B. With C. Because of D. for
辨析：1题选C。-ing形式复合结构his wife’s being there作Because of的宾语。2题选A。Because引导原因状语从句。3题选B。With后接复合宾语，作原因状语。
点击八：
1.____ this medicine, and you will be all right.
2.____ this medicine, you will be all right.
3.____ this medicine, it will cure you of your illness.
A. To takeB. TakeC. Taking D. If you take
辨析：1题的答案为B。and 连接两个并列分句，前面的祈使句此时相当于一个条件从句。2题的答案为C或D。选C时，现在分词短语作状语；选D时，是一个主从复合句。3题的答案为D。if引导条件状语从句。注意：3题不能选C，因为逻辑主语不一致。
点击九：
1. I admired the painting, and Ed said he would like me to have ____ as a gift from him. (2008四川)
A. one B. it C. this D. some
2. I prefer a flat in Inverness to ____ in Perth, because I want to live near my mom’s. (2005天津)
A. one B. that C. it D. this
辨析：1题答案为B。指代前面出现过的the painting，是特指。2题答案是A。替代前面出现过的 a flat, 是泛指。
____ is known to everybody, the moon travels round the earth once every month.
A. It B. As C. That D. What
此题的答案为B, as 在这引导一个非限制性定语从句，修饰后面的内容。但有学生在做题时很困惑，不明白为什么不选A或D。这就说明他们对一些句型结构分辨不清，我们把题目做以下变化：
1.____ is known to everybody that the moon travels round the earth once every month.
2.____ is known to everybody is that the moon travels round the earth once every month.
A. It B. As C. That D. What
1题答案为A。it作形式主语，真正的主语是that引导的从句; 而2题答案为 D。what在此引导一个主语从句，它在从句当中充当主语，而后面的that引导的从句则是表语从句。
所以易混句型是广大学生学习中的一个难点，也是高考中的一个重点内容，不但在单项选择题中出现，而且在短文改错中，完形填空中也有涉及,而学生在备考过程中往往很困惑，本文作者通过对部分高考题和平时的模拟试题进行分析、研究和归纳，总结以下常见易混句型，并加以辨析，帮助学生提高成绩。
点击一：
1. It was in New Zealand ____ Elizabeth first met Mr. Smith. (2008全国)
2. It was New Zealand ____ Elizabeth first met Mr. Smith.
A. that B. how C. which D. where
辨析：1题答案为A。that 引导的是强调句型。2题答案为D。句中New Zealand 是先行词，where引导的是定语从句。
点击二：
1.It is such an interesting book ____ all of us like.
2.It is such an interesting book ____ all of us like it.
A. that B. which C. as D. when
辨析：1题答案为C。“such…as…”结构，as引导定语从句，在从句中作宾语。2题答案为A 。“such…that…”结构，that引导结果状语从句。
点击三：
1.It was 3 years ____ he came back.
2.It was 3 years ago ____ he came back.
3.It is 3 years ____ he came back.
A. since B. that C. when D. before
辨析：1题答案为D。意为“过了三年，他才回来。”It在此表时间，特别注意，主、从句时态的一致。2题答案为B。此句是强调句型，特点是可以还原成一个完整的句子，还原后的句子是：He came back 3 years ago. 3题答案为A。since表从过去到现在为止。
点击四：
1.I was told that there were about 50 foreign students ____ Chinese in the school, most ____ were from Germany. (2006辽宁)
2.I was told that there were about 50 foreign students ____ Chinese in the school, and most ____ were from Germany.
3.I was told that there were about 50 foreign students ____ Chinese in the school, most ____ from Germany.
A. study; of whomB. study; of them
C. studying; of them.D. studying; of whom
辨析：1题答案为D。第一空studing是非谓语，因为句子已经有谓语动词were, whom引导一个非限制性定语从句，起补充作用。2题答案选C。and连接两个并列句。3答案为C。为独立主格结构，起补充说明的作用。most of them与from Germany构成逻辑上的主谓关系。
点击五：
1.____ made his teacher angry.
2.____, his teacher got angry.
3.____, which made his teacher angry.
A. He being lateB. His being late
C. He was late. D. His late
辨析：1题答案为B。-ing形式复合结构His being late在句中作主语。2题答案为A 。He being late 为独立主格结构，在句中作状语。3题答案为C。为一个完整的句子，which引导非限制性定语从句修饰这个句子。
点击六:
1.It was not until 12 o’clock ____ home.
2.Not until 12 o’clock ____ home.
A. did he returnB. he returned
C. that he returnedD. that did he return
辨析：1题答案为C。为强调句式。2题答案为A。否定词提前，句子用倒装语序。
点击七：
1.____ his wife’s being there, I said nothing about it.
2.____ his wife was there, I said nothing about it.
3.____ his wife there, I said nothing about it.
A. Because B. With C. Because of D. for
辨析：1题选C。-ing形式复合结构his wife’s being there作Because of的宾语。2题选A。Because引导原因状语从句。3题选B。With后接复合宾语，作原因状语。
点击八：
1.____ this medicine, and you will be all right.
2.____ this medicine, you will be all right.
3.____ this medicine, it will cure you of your illness.
A. To takeB. TakeC. Taking D. If you take
辨析：1题的答案为B。and 连接两个并列分句，前面的祈使句此时相当于一个条件从句。2题的答案为C或D。选C时，现在分词短语作状语；选D时，是一个主从复合句。3题的答案为D。if引导条件状语从句。注意：3题不能选C，因为逻辑主语不一致。
点击九：
1. I admired the painting, and Ed said he would like me to have ____ as a gift from him. (2008四川)
A. one B. it C. this D. some
2. I prefer a flat in Inverness to ____ in Perth, because I want to live near my mom’s. (2005天津)
A. one B. that C. it D. this
辨析：1题答案为B。指代前面出现过的the painting，是特指。2题答案是A。替代前面出现过的 a flat, 是泛指。