We’ll do what we can _________ our environment.
#49518
A
protect
B
to protect
C
be protected
D
be protecting
推荐题目
When I came into the classroom, I saw some girls _______ happily.
#50604
A
cry
B
talk
C
to run
D
laughing
My father always has fun __________with the neighbours on weekends.
#50922
A
to play chess
B
playing chess
C
playing the chess
D
to play the chess