My pen pal Ann found it difficult ______ Chinese well.
#48777
A
learning
B
learn
C
to learn
D
learned
推荐题目
The boy was seen            on the sports ground.
#50866
A
to play
B
play
C
played
D
to playing
Do you find this book ____________?
#50339
A
frustrate
B
frustrating
C
frustrated
D
frustration
 The students were all tired, but ________of them stopped ____________ a rest.
#50654
A
no one; to have
B
none; having
C
none; to have
D
no one; having
Funny jokes can make us ________when we are sad..
#49037
A
laughing
B
laugh
C
laughed
D
laughs