The scientists ________ on the new medicine for two years. They will succeed in no time. A．workB．are workingC．have workedD．will work-初中英语-n多题

◎ 题干

The scientists ________ on the new medicine for two years. They will succeed in no time.

A．work

B．are working

C．have worked

D．will work

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◎ 解析

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◎ 知识点

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