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

 

【答案】

C

【解析】

試題分析: 句意：科學(xué)家們已經(jīng)研制這個(gè)新藥兩年了，他們馬上就要成功了。 in no time馬上；根據(jù)for

two years兩年，可知時(shí)態(tài)為現(xiàn)在完成時(shí)，故選C.

考點(diǎn)：考查現(xiàn)在完成時(shí)。

 

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