--- Did they have fun _____________?    --- Yes, they did.
#51333
A
to camp
B
camped
C
camping
D
camp
推荐题目
 She decided _________ a digital camera.
#51338
A
to buy
B
buying
C
bought
D
buy
Students should do everything they can __their study. 
#50600
A
improve
B
to improve
C
improving
D
improved
Although we’ve learned English for years, we have trouble _____ the       foreigners.
#50181
A
understand
B
to understand
C
understanding
D
of understanding