It’s important ________ the piano well. 
#70667
A
of him to play
B
for him to play
C
of him playing
D
for him playing
推荐题目
Would you show me __________ QQ,  please?
#69163
A
where to use
B
which to use
C
how to use
D
what to use
— _________ is your ruler?—It’s blue.
#70296
A
What
B
What’s color
C
How
D
What color