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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中学英语

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