We ___ on it for many hours but we have not yet reach any co

时间:2023-02-23 16:02来源:未知作者:admin 点击: 次

4. We ___ on it for many hours but we have not yet reach any conclusion. A. work B. have been work C. have work D. are working

4. We ___ on it for many hours but we have not yet reach any conclusion.

A. work

B. have been work

C. have work

D. are working

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