I think ______ is necessary ______ us to do something useful to protect the birds.
#50276
A
this; for
B
it; of
C
this; of
D
it;for
推荐题目
What do you get ________ your birthday?
#50351
A
to
B
for
C
with
D
as
Each member hopes to ________ the next match.
#48810
A
play at
B
play in
C
play by
D
play of