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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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