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    【题目】Please ______ that all lights are turned off.
    A.enclose
    B.enlarge
    C.ensure
    D.enable

    【答案】C
    【解析】句意：请确保所有的灯被关闭。A. enclose “ 围住,把,附上”； B. enlarge “扩大”；C. ensure “ 确保”； D. enable “使能够”。根据句意思可以推断出答案，故选C。

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