【題目】【原創(chuàng)】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】

試題分析：考查連詞。unless本身具有否定意義：if...not，引導的是否定的條件句，這種否定的條件句從反面來強調的語氣，一些語法學家稱它為“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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