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You __________be tired—you’ve only been working for an hour.

A．must notB．won’tC．can’t　　　　D．may not

C

解析試題分析：考查情態(tài)動(dòng)詞。根據(jù)you've only been working for an hour,可以推斷出前面這句話的意思是：你不可能累的。顯然這里也是考查情態(tài)動(dòng)詞表示推測(cè)的用法，表示“不可能”，應(yīng)該用can't. may, must表示推測(cè)時(shí)，只能用在肯定句中。句意：你不可能累的——你就工作了一個(gè)小時(shí)。故C正確。
考點(diǎn)：考查情態(tài)動(dòng)詞

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