More attention must be paid _ the endangered animals.A. protect B. to protect C. to prote

问题补充：

More attention must be paid _ the endangered animals.

A. protect

B. to protect

C. to protecting

D. protecting

答案：

A. protect

B. to protect

(答案→)C. to protecting

D. protecting

解析：句意：要更加注意保护频临灭绝的动物。这里是pay more attention to+doing，这里是它的被动结构，故选C。