Of course,the amount of time you spend each time mustbe ____ the limit that you do not exhaust ypurself. B.within ong side答案是B，请问其他的为什么不行呀？谢谢！
热心网友
withiny有以下两个意思：（1)Inside the limits or extent of in time or distance:(2)Inside the fixed limits of; not beyond:
热心网友
within the limit 是和 without limit 相反的词组，惯用法。