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You ________ be tired-you’ve only been working for an hour.

[  ]
A.

must not

B.

won’t

C.

can’t

D.

may not

答案:C
解析:

此题考查情态动词表示推测的用法。can’t表判断时含义为“不可能”。must not表示禁止,意为“不许”,won’t表示否定预测,意为“不会”,may not或许不,语气不确定。


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