—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
She saw a lot of boys ________ football on the playground when she walked past (经过).
#49483
A
play
B
to play
C
played
D
playing
Do you like NBA ?Yes, I do. I saw NBA ______several times last seasons.
#49187
A
to play
B
played
C
play
D
plays
I often hear him ______.Today when I pass(经过)the classroom, I hear him ______again .
#49624
A
sing; singing
B
singing; sing
C
singing; singing
D
sing; sing