To protect the environment,more trees _____ in our country every yearA plant B were planted C be planted D must be planted

问题描述:

To protect the environment,more trees _____ in our country every year
A plant B were planted C be planted D must be planted

D

选D。首先,树是被种的,用被动,时间状语是every year,排除B。每年必须种树。

D

情态动词被动语态: must be + 过去分词

从 every year 每年,一般现在时,排除B 一般过去时的被动语态


祝你学习进步,更上一层楼! (*^__^*)
不明白的再问哟,请及时采纳,多谢!