We didn't know what we should do next.We didn't know what __ __ next

问题描述:

We didn't know what we should do next.We didn't know what __ __ next

填to do,在what特殊疑问词后之后不定时可以表将来

We didn't know what _to_ _do_ next
意思是:我们不知道接下来该干什么。
希望采纳哦~~

to do
特殊疑问词+ to do 形式

to do
动词不定式