We _____ in this pool when we were young, but now it _____ fish. 
#59147
A
are used to swim; used to keep
B
are used to swimming; used to keep
C
used to swimming; is used to keep
D
used to swim; is used for keeping
推荐题目
-Will she ________ go with you?  –Well, I’m not sure.      
#58653
A
can
B
is able to
C
are able to
D
be able to
Teenagers should not _____ . 
#55314
A
allowed to drive
B
be allow to driving
C
be alloweddriving
D
be allowed to drive