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：i￡．．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)強(qiáng)調(diào)的語(yǔ)氣，一些語(yǔ)法學(xué)家稱它為“反面的惟一條件句”，如： One cannot master a foreign language well unless he studies it hard．
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