问题补充:
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
答案:
A. makes
B. 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。