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!
To protect the environment,more trees _____ in our country every year
To protect the environment,more trees _____ in our country every year
A plant B were planted C be planted D must be planted
A plant B were planted C be planted D must be planted
英语人气：886 ℃时间：2020-03-11 17:44:37
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