-What trouble do you have when you learn English?- __________the grammar in a right way. 
#49768
A
Use
B
To use
C
Using
D
To using
推荐题目
Now there are already robots _________ in factories.
#50464
A
working
B
to work
C
work
D
worked
I prefer ____some shopping to _____ camping since the weather isn’t lovely.
#50099
A
do ; going
B
doing ; go
C
do ; go
D
doing ; going