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Every evening the students go to bed at 10:30______ and the lights are turned off.
A.at onceB.on purposeC.at presentD.as usual
D

试题分析: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。
点评:介词短语一直是命题者常设置的考点和重点,平时要加强记忆。本题的四个选项都很重要,尤其要注意四个短语在具体语言环境中的使用,考生应注意对短语的正确归类和对词义的准确理解。
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