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The English idiom______means "something that spoils the perfection of something". [ ]
A、white elephant
B、flesh and blood
C、an apple of discord
D、fly in the ointment
【正确答案】：D
【题目解析】：本题考查的是对这四个名词性习语的含义的掌握。A是无用而且昂贵的东西，B是指亲戚，C是争议矛盾的源头，D是破坏完美的因素。