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Scientists say it may be two years _____...

Scientists say it may be two years ________ this new medicine can be tested on human patients.

A.before B.after C.since D.when

 

A 【解析】 考查连词。句意:科学家表示,这种新药可能需要过两年时间才能在人类患者身上进行测试。A. before 在……之前;B. after在……之后;C. since自……时候;D. when当……时。本题考查 It + be + some time + before从句,表示“多久之后才……”。故选A。
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