The scientists ________ on the new medicine for two years. They will succeed in no time.
A．workB．a(chǎn)re workingC．have workedD．will work
C

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.
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