We don't know ________ it next. Let's go
问题:
We don't know ________ it next. Let's go and ask Mr. Li. [ ]
A. what to do
B. to do what
C. whether to do
D. to do whether
We don't know ________ it next. Let's go and ask Mr. Li. [ ]
A. what to do
B. to do what
C. whether to do
D. to do whether