问题补充：
---- Who knocked at the door?
---- I’ve no idea. I just pretended nobody was at home, so I didn’t ask who was.
A. he
B. that
C. she
D. it
答案：
A. he
B. that
C. she
(答案→)D. it
解析：此题未指明敲门人的性别，所以用it。
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