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Scientists say it will be five or six years __________ it is possible to test this medicine on humans.
A.afterB.beforeC.sinceD.when
B
    
试题分析:句意:科学家说还需要六年的时间才有可能在人身上实验这种药物。A在……之后;B在……之前;C自从;D当……时候。固定句型:it will be +时间段+before从句“还要多久才”。答案选B。
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