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    【题目】You won't find it difficult ______ you have mastered it.
    A.before
    B.while
    C.once
    D.though

    【答案】C
    【解析】句意：一旦你掌握了它，你就不会觉得它很难了。A. before在……之前；B. while当……的时候；C. once一旦；D. though尽管。根据句意可知选C。

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