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    【题目】The room is very dark. Please __________ the light.

    A. switch on

    B. switch off

    C. put up

    D. put down

    【答案】A

    【解析】句意:这个房间很暗。请打开灯。switch on （开关）开启；switch off（开关）关掉；put up建造，提高；put down镇压，记下。

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