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We _______ on this project for four hours. Let’s have a rest.

    A. are working      B. have been working

C. worked          D. had worked

 

【答案】

B

【解析】考察时态。根据for four hours可知是与现在完成时连用的,在根据句意可知使用现在完成进行时。句意:我们已经一致工作了4个小时,让我们休息一下。

 

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