问题补充:
Remember to the lights before you leave the classroom.
A. turn off
B. turn on
C. turn up
D. turn down
答案:
(答案→)A. turn off
B. turn on
C. turn up
D. turn down
解析:句意:记住离开教室前关灯。turn off关; turn on开;turn up放大; turn down调低。所以选A。
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