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    【题目】【原创】A man does not know the difficulty of anything_________ he does it personally.

    A. although B. if C. because D. unless

    【答案】D

    【解析】

    试题分析：考查连词。unless本身具有否定意义：if...not，引导的是否定的条件句，这种否定的条件句从反面来强调的语气，一些语法学家称它为“反面的惟一条件句”，如： One cannot master a foreign language well unless he studies it hard．

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