He often spends much time________playing the piano. 
#49131
A
practice
B
practices
C
to practice
D
practicing
推荐题目
They are both very nice.I don’t know ___
#50154
A
what to choose
B
to choose what
C
which one to choose
D
to choose which one
My pen pal Ann found it difficult ______ Chinese well.
#48777
A
learning
B
learn
C
to learn
D
learned
Don’t forget ______ the door when you leave.
#49672
A
close
B
closed
C
to close
D
closing