Students should do everything they can __their study.
#50600
A
improve
B
to improve
C
improving
D
improved
推荐题目
As Jack left his membership card at home, he wasn't allowed_______ into the sports club.
#49422
A
going
B
to go
C
go
D
gone
Mr Smith’s watch doesn’t work, so he’s going to ask someone _______it．
#49456
A
fix
B
to fix
C
fixing
D
to fixing