题目内容

There is no doubt that_____ the environment is imperative.

A. protecting
B. be protected
C. protect
D. to protect

查看答案

搜索结果不匹配？点我反馈

更多问题

____ a great contribution to his country, Tom was awarded a medal of honor bythe government.

A. Have made
B. Made
C. Having made
D. Making

When guests or friends come to our home, the etiquette ofand____ teais indispensable.

A. make; serve
B. making; serving
C. made;served
D. having made; having served

Lilys sudden__ made her parents hard to accept.

A. leaves
B. left
C. leaving
D. to leave

There's no ______ whether it will rain or not.

A. known
B. knowing
C. know
D. knew