题目内容

19．-Tom has been working for more than 9hours!
-He _________be very tired．（　　）
A．willB．mustC．has toD．shall

分析 --Tom已经工作9个多小时了！
--他肯定非常累．

解答 答案是B．本题考查情态动词表示推测的用法．情态动词must常常用在肯定句中表示"肯定、一定"，表示有客观依据的推测；根据句意，"Tom已经工作9个多小时"的客观依据推测，他"肯定非常累"，所以答案选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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