Although we’ve learned English for years, we have trouble _____ the       foreigners.
#50181
A
understand
B
to understand
C
understanding
D
of understanding
推荐题目
I couldn’t wait _____ the box as soon as I received the gift.
#49148
A
to open
B
open
C
opening
D
for opening
What about__________ tomorrow?
#50850
A
go swimming
B
going swim
C
go to swim
D
going swimming