题目内容

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

试题分析: 句意：科学家们已经研制这个新药两年了，他们马上就要成功了。 in no time马上；根据for
two years两年，可知时态为现在完成时，故选C.
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