问题
选择题
Sleeping with the lights on is a waste. You'd better______all the lights are off before you go to bed.
[ ]
A. look for
B. try out
C. make sure
D. think hard
答案
答案：C
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Sleeping with the lights on is a waste. You'd better______all the lights are off before you go to bed.
[ ]
A. look for
B. try out
C. make sure
D. think hard
答案：C