【題目】—Who__________ it be that is knocking at the door? —It __________ be Father, but I'm not sure.
A.can; must
B.can; may
C.must; can
D.may; must

【答案】B
【解析】must表示“一定,必須”,語氣比較強(qiáng)烈,說話人對所說的事情比較肯定。can和may表示可能,前者語氣強(qiáng)于后者,根據(jù)答語中but I'm not sure可以肯定說話者不是很確定,故第二個空應(yīng)填may;第一個空不能夠太絕對,因為說話者并不能確定敲門的人是誰。故答案選B。

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