He often spends much time________playing the piano. 
#49131
A
practice
B
practices
C
to practice
D
practicing
推荐题目
Our teacher often tells us ________ too much time watching TV.
#49379
A
don’t spend
B
not spend
C
not to spend
D
not spending
They made the children ________every morning.
#48474
A
exercising
B
to exercise
C
exercised
D
exercise
Dr. Ma used to            two or three persons in the hospital.
#49403
A
operate on
B
operating on
C
operate for
D
operating for