问题描述：
高三英语还跟急关于until和before的!
这句话是,He had never exercised until joining the club 9 months ago.为什么不能把until改成before?很急!
这句话是,He had never exercised until joining the club 9 months ago.为什么不能把until改成before?很急!
问题解答：
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