You will find it difficult__you have mastered the rules.

A.once B.unless C.before D.as soon as 若原题改为You won't find it difficult__you have mastered the rules.又选哪个,为什么?

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B若原题改为You won't find it difficult__you have mastered the rules.又选哪个,为什么? A/donce 作一旦讲unless除非before 之前as soon as 一....就

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原来的：选B，“除非” 改了的：选A，“一旦”

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原来的：选B，“除非”改了的：选A，“一旦”你英语应该不错吧？还会自己改题

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You will find it difficult__you have mastered the rules.选C, BeforeYou won't find it difficult__you have mastered the rules.选A once