Question

【题目】—There is a lot of wind in North China.

—Well, more trees ________ every year to stop the wind.

A. must be planted B. can planted C. should planted D. planted

Answer 1

【答案】A

【解析】

句意：——在中国北部有许多风。——每年必须更多的树需要被植来阻止风。根据trees和plant之间是被动关系，所以用被动语态，含有情态动词的被动语态结构：情态动词+be +过去分词；故选A