六年级英语题..急急..帮帮忙.!

they不能用studies题干错了
They study very hard.
变How hard they study!

how hard they study ! 题目打错了吧！既然是第三人称复数就不该把stury去y加ies~~~~~只有第三人称单数才要这样啊~~~~~~~~·

How hard they study!
你确定题目没问题吗?