—Thecentreisdoingalottoprovidegoodeducationfortheleft-b...

问题详情：

— The centre is doing a lot to provide good education for the left-behind children.

       — Yeah, but it’s not good enough. They should try ______.

A. hard                         B. harder

       C. hardest                    D. hardly

【回答】

B

知识点：副词

题型：选择题