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

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A. who is he
B. who he is
C. who it is
D. who is it
解析：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。