Every evening the students go to bed at 10:30 and the lights are turned off.A. at onceB. o

Every evening the students go to bed at 10:30 and the lights are turned off.
A. at once
B. on purpose
C. at present
D. as usual

A. at onceB. on purposeC. at present(答案→)D. as usual解析：介词短语辨析。A立刻，马上；B故意；C目前，现在；D和平时一样；句意：每天晚上学生都和平时一样在10点30睡觉，灯光就在那个时候被熄灭。故D正确。

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