How did you know what to do next?

How did you know what to do next?


How did you know what you should do next?
If you have any questions, keep asking me
[English cattle group]



I really don't know ( ).A.what to do the next B.what to do it next C.how to do the next
D.what to do next


d



I don't know what to do next
Please don't say it's through language sense,
Please specify the specific grammar


Interrogative + infinitive (to do) is a fixed collocation, and "what to do next" is the object of the verb know