◎ 题干
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
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“We_____ on this project for four hours. Let's have a rest. [ ]A. are working B. have been working C. worked D. had worked …”主要考查了你对  【现在完成进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。