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    【题目】Scientists say it will be five or six years ________ it is possible to test this medicine on humans．

    A．after B．before C．since D．When

    【答案】B

    【解析】

    试题分析：A.after在...之后 B.before在...之前 C.因为 D.when引导时间状语从句。句意：科学家说将这种药品应用于人类身上的可能性将会在5—6年内实现。

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