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【题目】Please ______ the computer. It's time to go to bed.
A.turn up
B.turn off
C.turn on
D.turn down

【答案】B
【解析】句意:请关掉电脑,是睡觉的时间了。turn up调大;turn off关掉;turn on打开;turn down调小。根据句意可知选B。

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