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    【题目】It was nearly an hour __________ the sleeping pill __________ effect.

    A. when; took B. before; took

    C. since; takes D. before; would take

    【答案】B

    【解析】句意:安眠药在大约一个小时后起作用, It was...before…过了……才……；take effect 开始起作用，见效。

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