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I ________ for three hours when I suddenly became sick.

[  ]
A.

had been working

B.

would work

C.

have worked

D.

am working

答案:A
解析:

此题考查时态的正确使用,句意:我工作了三小时,这时候我突然觉得不舒服。空格处应该用过去进行时、过去完成时或过去完成进行时才能与时间状语for three hours连用。


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