题目内容

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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