Many teens don’t get enough sleep because they have too much homework, which them up at

Many teens don’t get enough sleep because they have too much homework, which them up at night.
A. makes
B. breaks 
C. turns
D. keeps

A. makesB. breaks C. turns(答案→)D. keeps解析：本题考查短语动词的辨析。跟人作宾语时，make sb.up指“化妆”；break up指“驱散”；turn up一般不接人作宾语；keep up指“使某人熬夜”。根据句子的意思得出答案。

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