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31.Who called?谁来过?32.Who phoned?谁来过电话?33.Who is it?=Who?谁?34.Who is he?他是谁?35.Who was that?那是谁?36.Who spoke?谁说过?
Who is who? 32.Who phoned? Who has been on the phone? 33.Who is it? = Who? Who? 34.Who is he? Who is he? 35.Who was that? 36.Who spoke? Who said?