题目内容

Someone is ringing the doorbell. Go and see ______ .
A．who is heB．who he isC．who it isD．who is it
C 

试题分析：句意：有人在按门铃，去看看是谁？因为是不知道的人，用代词it，而且因为是宾语从句，所以语序是陈述句语序，主语it在be动词前面，选C。
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