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    精英家教网 > 高中英语 > 题目详情
    A man does not know the difficulty of anything _______ he does it personally.
    A．although B．if C．because D．unless
    D

    试题分析：A. although尽管，引导让步状语从句，一般置于句首，用逗号隔开；B. if假如，尽管，是否C. because 因为，引导原因状语从句；D. unless除非，否则；句意：一个人不可能知道所有事情的难度，除非他亲自动手做它。故选D.
    点评：本题注意although引导让步状语从句时不能倒装，而if引导让步状语从句，习惯将表语提前，构成倒装，如果表语是单数可数名词要省略不定冠词。uunless一词前面常要有否定意义的词，句意才符合逻辑。例如：We will easily become unhappy unless we deal with our problem well.
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