题目内容

20.-Where's Mary?
-I'm not sure.She _________be in the reading room.
A.needB.mayC.must

分析 --玛丽在哪里?
--我不确定.她可能在阅览室里.

解答 答案:B.need需要;may可能;must一定,必须.根据I'm not sure,在这里表示不确定,表示可能性不大,may可能,在表示推测时不如must可能性大.故选B.

点评 本题考查了情态动词的用法.解答时注意:must表示推测时,可能性要比may大.

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