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It was nearly an hour _____________ the sleeping pill _____________ effect.
A.when; tookB.before; tookC.since; takesD.before; would take
B

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。
点评:before引导的从句一直都是时态考查的重点内容,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;
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