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 |
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答案
| D |
解析
| 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。) |
举一反三
They kept trying _____ they must have known it was hopeless.| A．if | B．because | C．when | D．where |
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| He was not an actor, who often appeared on stage, _____ a writer, writing stories. |
| ____ I agree with most of what you said, I don"t agree with all. |
He told me the news_____, believe it or not, he had earned $1 000 in a single day.| A．that | B．which | C．as | D．because |
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It was very cold ____ they still went swimming.| A．although | B．but | C．however | D．though |
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