---Mr. Black, I find  ______  difficult to play the piano well.---Oh, I think you just need to practice more  
#35100
A
it
B
it is
C
this
D
that
推荐题目
Look! ________an eraser.
#35264
A
This’s
B
It’s
C
What’s
D
That
Come on, boys and girls. Help ____________ to all the yummy food. 
#34922
A
yourself
B
youselves
C
yourselves
D
youself