题目内容

Every year lots of trees       to make our country more beautiful.
A. is planted              B. are planted            C. plant
B

试题分析：句意：每年会种很多的树来让我们国家变得更漂亮。句中用被动语态，结构为be+动词过去分词；主语是复数，故此题选B。
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