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Many teens don’t get enough sleep because they have too much homework to do, which _______ them up at night.

A.makes B.breaks C.turns D.keeps

D. 

解析试题分析:考查动词辨析:A. makes制作B. breaks打破C. turns转D. keeps保持,keep up是词组“维持,不低落”这里是“不能睡觉”,句意:很多年轻人没有足够的睡眠,因为作业太多,这使他们晚上不能睡觉。选D。
考点:考查动词辨析
点评;动词辨析考查平时的记忆是否牢,除了动词的拼写,含义也要记牢,还有的动词有不同含义要记全,相似的动词要辨析清楚。

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