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

分析 --Tom已經(jīng)工作9個多小時了！
--他肯定非常累．

解答 答案是B．本題考查情態(tài)動詞表示推測的用法．情態(tài)動詞must常常用在肯定句中表示"肯定、一定"，表示有客觀依據(jù)的推測；根據(jù)句意，"Tom已經(jīng)工作9個多小時"的客觀依據(jù)推測，他"肯定非常累"，所以答案選B．

點評 要在正確理解情態(tài)動詞的基本含義的基礎上，整體理解語境中的情感態(tài)度，做出合理的判斷．

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