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. 

解析試題分析：考查動詞辨析：A. makes制作B. breaks打破C. turns轉(zhuǎn)D. keeps保持，keep up是詞組“維持，不低落”這里是“不能睡覺”，句意：很多年輕人沒有足夠的睡眠，因為作業(yè)太多，這使他們晚上不能睡覺。選D。
考點：考查動詞辨析
點評;動詞辨析考查平時的記憶是否牢，除了動詞的拼寫，含義也要記牢，還有的動詞有不同含義要記全，相似的動詞要辨析清楚。

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