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    精英家教网 > 初中英语 > 题目详情
    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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