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Scientists say it may be five or six yea...

Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.

A.since             B.after             C.before            D.when

 

C 【解析】 试题分析:考查固定句型:It will/may be+一段时间+before…,要过多长时间才/就…,句意:科学家说要再过五六年这种药物才能在人身上试验。故选C。 考点:考查固定句型
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