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

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

选项 A、are working
B、have been working
C、worked
D、had worked

答案B

解析 本题考查动词的时态,由“four hours”可知应用完成时态,排除A和C:由“Let’s have a rest”可知工作还没完,因此应该用现在完成进行时。故选B。
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