A man does not know the difficulty of anything______he does it personally.

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问题 A man does not know the difficulty of anything______he does it personally.

选项 A、although
B、if
C、because
D、unless

答案D

解析 句意:除非他亲自去做,否则他不会知道这件事的难度。A项although意为“尽管”,引导让步状语从句,一般置于句首,用逗号隔开;B项if意为“假如,尽管,是否”;C项because意为“因为”,引导原因状语从句;D项unless意为“除非,否则”;根据句意,故答案选D。
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