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
答
D
答
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。
答
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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