—I have never been to the Great wall. —If you have an opportunity _______ there, you must take it.
#48916
A
to go
B
to going
C
going
D
go
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They decided           at the end of this month.
#49560
A
to leave
B
going back
C
travel
D
not start out.
I don’t know _____ next.
#49598
A
how to do
B
what to do
C
what can I do
D
how I can do