—It’s necessary ____ our environment(环境). —I agree with you.
#50553
A
protect（保护）
B
protecting
C
to protect
D
protects
推荐题目
Simon made a big bamboo box _______ the little sick bird till it could fly.
#49425
A
keep
B
kept
C
keeping
D
to keep
The young man used to _______ to work,but he is used to _______to work now.
#50511
A
drive,walking.
B
drove,walked.
C
drive,walks.
D
driving,walk
Why not_____an English club to practice_____English?
#51265
A
to join; to speak
B
join; speaking
C
join; to speak
D
to join; speaking
What bad weather it was! We decided .
#49184
A
not to go out
B
to go out
C
to not go out
D
not going out