A man does not know the difficulty of anything _______ he does it personally.A．a
题型：不详难度：来源：
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：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. |
举一反三
A lot of people don’t learn from their mistakes ______ they get hurt.
| A．whether | B．when | C．if | D．unless |
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--- Are your family ready for rafting?
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______ you have finished your work, you ought to have a good rest. | A．For | B．What if | C．Even when | D．Now that |
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Students continue to eat in school canteen______ they complain the quality of the food . | A．as though | B．even though | C．as long as | D．unless |
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