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I saw him leave the office an hour ago. He at this time. A. mustn’t be working B

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I saw him leave the office an hour ago. He at this time. A. mustn’t be working B

Isaw him leave the office an hour ago. He ________ at this time.

A.mustn’t be working    B.can’t be working

C.can’t work    D.may not working

 

试题答案

答案:B

提示:

atthis time表明应用进行时态。现在他不可能在工作。