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. We on this project for four hours. Let’s have a rest. A. are working B. have b

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. We on this project for four hours. Let’s have a rest. A. are working B. have b

(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

试题答案

B