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    【题目】You should inspect the wheels regularly, and replace them ______ they cause you trouble.
    A.while
    B.when
    C.before
    D.until

    【答案】C
    【解析】句意：你应该在出事之前经常检查车轮并及时更换。A.while”当.....时，然而”；B. when“在.......时候，随着”；C.before 在......之前“；D. until”直到.....才“。故选C。

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