问题描述：
求分析英语句子
So far so good,except the trick - which no one had quite figured out until now - is how to keep the shoe balanced and comfortable both on tip-toe and when you tilt it back to sit on a low heel.
那个定语从句里面过去完成时为什么还跟着until now
如果把两个“-”之间的部分去掉的话 剩下的except the trick is how…… 读起来感觉好怪 这个句子到底怎么分析
So far so good,except the trick - which no one had quite figured out until now - is how to keep the shoe balanced and comfortable both on tip-toe and when you tilt it back to sit on a low heel.
那个定语从句里面过去完成时为什么还跟着until now
如果把两个“-”之间的部分去掉的话 剩下的except the trick is how…… 读起来感觉好怪 这个句子到底怎么分析
问题解答：
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