-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 题目和参考答案——青夏教育精英家教网——

题目内容

20．-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

分析 --可能在谁在敲门呢？
--也许是父亲，但是我不确定．

解答答案是B．本题考查情态动词辨析．在疑问句中表示可能性的推测往往用can，may和must表示推测不出现在疑问句中，所有答案在A 和B中选择；must表示推测时是非常肯定的有依据的判断，may表示不确定的推测；根据下文的not　sure判断不确定是父亲，所以第二空选择may，故答案选择B．

点评要在正确理解情态动词的基本含义的基础上，整体理解语境中的情感态度，做出合理的判断．

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