-What are they doing? -They are talking      the phone       their life.
#50093
A
on; about
B
in; about
C
to; about
D
on; on
推荐题目
The bridge is          the river.
#48055
A
on
B
over
C
in
D
under
There is a big tree ________ the classroom.
#48535
A
in front of
B
at the front
C
in the front of
D
in front