【題目】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：請關(guān)掉電腦，是睡覺的時間了。turn up調(diào)大；turn off關(guān)掉；turn on打開；turn down調(diào)小。根據(jù)句意可知選B。

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