题目内容

A man does not know the difficulty of anything_________ he does it personally.
A．althoughB．ifC．becauseD．unless
D
连词unless本身具有否定意义：i￡．．not，引导的是否定的条件句，这种否定的条件句从反面来强调的语气，一些语法学家称它为“反面的惟一条件句”，如： One cannot master a foreign language well unless he studies it hard．
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