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

问题补充：

Someone is ringing the doorbell. Go and see .

A. who is he

B. who he is

C. who it is

D. who is it

答案：

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。