【題目】-- 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：—有人在敲門�！@個時間了，可能是誰呢？may可能，用于肯定句；can可能，用于否定句和疑問句；must一定；should應該。這是特殊疑問句，根據(jù)句意可知選B。

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