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16.-Who______ it be that is knocking at the door?
-It _____ be Father,but I'm not sure.(  )
A.can; mustB.can; mayC.must; canD.may; must

分析 --谁在敲门?--也许是父亲,但我不确定.

解答 答案B.
can可能;must必须;may可能.can,用于否定或疑问句表示推测"可能",没有什么把握,所以第一个空格是can,may表示不是很确信的事情与后面的语境but I'm not sure相符合.故答案选B.

点评 本题考查情态动词的用法.情态动词表示说话人对某一动作或状态的态度,在做题时应该把握好说话人的情感态度.

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