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    精英家教网 > 高中英语 > 题目详情
    You should not go rafting ________ you know how to swim.
    A．ifB．if notC．whenD．unless
    D

    试题分析：考查连词辨析。A如果；B如果不；（其中的not要与…分开）；C当…时；D除非；如果…不…；句意：如果你知道如何游泳，你本不应该去漂流。故D正确。
    点评：连词的词义辨析要放在上下文的语境中进行，要注意上下文的语义的串联以及逻辑关系的推理，特别要注意一些连词和时间状语的固定搭配。
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