改错题(只有一处错误) I have to do what i can improve my spoken English

问题描述:

改错题(只有一处错误) I have to do what i can improve my spoken English
写明原因谢谢了

I have to do what i can to improve my spoken English
what i can作都的宾语 是宾语从句
不定式to improve作目的状语