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It was nearly an hour _____________ the ...

It was nearly an hour _____________ the sleeping pill _____________ effect.

A.when; took        B.before; took       C.since; takes        D.before; would take

 

B 【解析】 试题分析:考查固定句式和时态。本题中的固定句式:It be 一段时间 before…一段时间以后某事才发生;如果before后面使用一般现在时,前面的主语使用将来时;如果before后面使用一般过去时,前面也使用一般过去时;句意:一个小时以后安眠药片才开始生效。前后都使用过去时。故B正确。 考点:考查固定句式的时态
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