答案是B告诉我为什么啊把句子写的完整好吗?it was nearly an hour____ the sleeping pill ____effect.A when,took B before ,took C since,had D before,had

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答案是B告诉我为什么啊把句子写的完整好吗?it was nearly an hour____ the sleeping pill ____effect.A when,took B before ,took C since,had D before,had

答案是B告诉我为什么啊把句子写的完整好吗?it was nearly an hour____ the sleeping pill ____effect.A when,took B before ,took C since,had D before,had
答案是B告诉我为什么啊把句子写的完整好吗?
it was nearly an hour____ the sleeping pill ____effect.
A when,took B before ,took C since,had D before,had

答案是B告诉我为什么啊把句子写的完整好吗?it was nearly an hour____ the sleeping pill ____effect.A when,took B before ,took C since,had D before,had
首先排除C,D因为原句是:安眠药需要一个小时“才”会起效.起效是:take effect.所以从A,B中选.而when强调的是时间点.before强调的是时间段前,而且多翻译为“才,就”的意思.原文很明显是“才”的意思.所以选择B.

take effect起作用,有效,固定搭配
整句句意是安眠药起效前已经过了1小时,根据句意选B

take effect生效。全文翻译如下:这种安眠药生效需要将近1小时。选B是根据句意的逻辑关系,药生效前过去1小时,而不是当药生效时是1小时

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