Mary often studies English by _______ with a group.
#49704
A
working
B
work
C
to work
D
worked
推荐题目
I’d like to trek ______ the jungle. 
#48264
A
through
B
across
C
over
D
on
Mary sits _________ the classroom and I sit _________ her.
#46294
A
in the front of, in the front of
B
in front of, in front of
C
in the front of, in front of
D
in front of, in the front of