【題目】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:安眠藥在大約一個小時后起作用, It was...before…過了……才……；take effect 開始起作用，見效。

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