Previously ______ at a fast food restaurant, the Smiths were dissatisfied with the unhealthy meals they served there. 
#93071
A
volunteered
B
to volunteer
C
volunteering
D
having volunteering
推荐题目
----You _______ part in the party in time. ----Sorry I was delayed by the accident.
#96933
A
are supposed to take
B
have supposed to take
C
are supposed to have taken
D
supposed to take
Parents often have their children_____ little housework so that they can have more time______. 
#95750
A
doing; studying
B
done; studied
C
to do; to study
D
do; to study
_______ time, he’ll make a first-class tennis player. 
#98605
A
Having given
B
To give
C
Giving
D
Given