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【题目】Remember to _____the lights before you leave the lab.

A. turn on B. turn down C. turn up D. turn off

【答案】D

【解析】

句意:在你离开实验室之前,记住关掉灯。A. turn on打开;B. turn down调低;C. turn up调高;D. turn off关掉。根据下文before you leave the lab可知上文是关掉。根据题意,故选D。

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