We on this project for four hours. Let’s have a rest.A. are workingB. have been workingC.

问题补充：

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：

A. are working

(答案→)B. have been working

C. worked

D. had worked

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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