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

A．work B．a(chǎn)re working C．have worked D．will work 

C

解析試題分析: 句意：科學(xué)家們已經(jīng)研制這個新藥兩年了，他們馬上就要成功了。 in no time馬上；根據(jù)for
two years兩年，可知時態(tài)為現(xiàn)在完成時，故選C.
考點：考查現(xiàn)在完成時。

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