Books are helpful _____ us.
#50001
A
from
B
on
C
in
D
to
推荐题目
-What are they doing? -They are talking the phone their life.
#50093
A
on; about
B
in; about
C
to; about
D
on; on
Books are helpful _____ us.
-What are they doing? -They are talking the phone their life.