To tell you the truth,he has already regretted wasting the p

3个回答

  • 把这个定语从句单独拿出来就是he should have studied hard at the precious time(他本应该将这些真贵的时间花在学习上的),直接用when来替代at the precious time,充当状语成分. 而that指代的是the precious time,不能作此句的状语.如果hard的后面有个at,就可以选择that或which.说的很深奥的样子.但是慢慢你就会发现规律的了.