—It’s necessary our environment(环境). —I agree with you. A. protect（保护）B. protectingC. to

问题补充：

—It’s necessary our environment(环境). —I agree with you.

A. protect（保护）

B. protecting

C. to protect

D. protects

答案：

A. protect（保护）

B. protecting

(答案→)C. to protect

D. protects

解析：it’s +adj+ to do sth表示做某事对某人来说怎样