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【题目】-- Someone is knocking at the door.
-- Who ______ it be at this hour of day?
A.may
B.can
C.must
D.should

【答案】B
【解析】句意:—有人在敲门。—这个时间了,可能是谁呢?may可能,用于肯定句;can可能,用于否定句和疑问句;must一定;should应该。这是特殊疑问句,根据句意可知选B。

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