问题
选择题
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
D
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。