you can get good grades __hard A.to work B.in wo
问题描述:
you can get good grades __hard A.to work B.in wo
you can get good grades __hard A.to work B.in working C.by work D.by working 为什么选D
答
by加doing表示通过什么方式这题是我们通过努力学习来得到好成绩