A man does not know the difficulty of anything _____ he does it personally .
A．a(chǎn)lthoughB．ifC．becauseD．unless
D
連詞unless本身具有否定意義：if … not，引導(dǎo)的是否定的條件句，這種否定的條件句從反面來(lái)表達(dá)強(qiáng)烈的語(yǔ)氣，一些語(yǔ)法學(xué)家稱它為"反面的唯一條件句"又如：One cannot master a foreign language well unless he studies it hard . (不下苦功夫，是學(xué)不好的一門外國(guó)語(yǔ)的。)
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