Nobody noticed the thief slip into the house because the lights happened to .
A. put up
B. give in
C. be turned on
D. go out
网友回答
A. put up
B. give in
C. be turned on
(答案→)D. go out
解析：本题的关键是理解题干的意思。该试题主要测试动词短语的词汇意思区别。句子的含义是：“没有人注意到小偷进屋，因为那时灯熄了。”符合题意的只有D项“熄灭”。