问题描述：
—There is a knock at the door.—---------------?A.who is that?B.who can it be?...
—There is a knock at the door.
—---------------?
A.who is that?
B.who can it be?
C.who is he?
D.do you think who he is?
a和c为什么不对啊
—There is a knock at the door.
—---------------?
A.who is that?
B.who can it be?
C.who is he?
D.do you think who he is?
a和c为什么不对啊
问题解答：
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