Animalsareourclosefriends.Wearesupposed        them.A.t...

问题详情：

Animals are our close friends. We are supposed         them.

A. to protect                                                     B. protecting

C. protect                                                         D. protected

【回答】

A  be supposed to do sth.“应该或被期望做某事”。

知识点：动词和动词短语

题型：选择题