Animalsareourclosefriends.Wearesupposed        them.A.t...

問題詳情：

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.“應該或被期望做某事”。

知識點：動詞和動詞短語

題型：選擇題