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

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

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


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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

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