My mother is busy_____ the room.
#49979
A
clean
B
to clean
C
cleaning
D
cleans
推荐题目
---Don't skate on the lake! ---Why not? Isn't it thick enough___________?
#48601
A
to skate
B
skating on
C
skating
D
to skate on
Tom misses his brother very much and he is looking forward ____ him. 
#48593
A
to hear from
B
hearing from
C
to hearing from
D
heard from
They tell us some ways _________English well.
#49212
A
teach
B
learning
C
to learn
D
teaching
You need ________ fit.
#49609
A
exercise keeping
B
to exercise to keep
C
exercising keeping
D
to exercise keeping