My pen pal Ann found it difficult ______ Chinese well.
#48777
A
learning
B
learn
C
to learn
D
learned
推荐题目
As for _____homework, we do ________homework every day.
#49737
A
do , our
B
doing, our
C
does, we
D
doing, us
Dr. Ma used to            two or three persons in the hospital.
#49403
A
operate on
B
operating on
C
operate for
D
operating for