A man does not know the difficulty of anything he does it personally . A. although B. if C. because D. unless 答案是D项.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表达强烈的语气.一些语法学家称它为"反面的唯一条件句"又如:One cannot master a foreign language well unless he studies it hard . (不下苦功夫.是学不好的一门外国语的.) 查看更多

 

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A man does not know the difficulty of anything _____ he does it personally .

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

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A man does not know the difficulty of anything_________ he does it personally.

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

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A man does not know the difficulty of anything _____ he does it personally .

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

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A man does not know the difficulty of anything_________ he does it personally.

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

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A man does not know the difficulty of anything_________ he does it personally.

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

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