. We on this project for four hours. Let’s have a rest. A. are working B. have been worki——青夏教育精英家教网—

摘要：. We on this project for four hours. Let’s have a rest. A. are working B. have been working C. worked D. had worked

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（天津卷4）. We _______ on this project for four hours. Let’s have a rest.

A. are working B. have been working C. worked D. had worked

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