Question

求翻译，求解释，求答案，超急，谢谢！

求翻译，求解释，求答案，超急，谢谢！What you should do is ________ （study）harder than before.

Answer 1

What you should do is _to_study__ （study）harder than before.

Answer 2

What you should do is studing harder than before.

Answer 3

你应该做的是________(研究)比以前更努力。

追问

那个是填studying吗？

追答

应该是的，你试试看。