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题型：单选题 题类：常考题 难易度：普通
北京市海淀区2019届九年级下学期英语5月期中考试试卷
—That's quite meaningful. If more trees ____, we'll have a greener world.
A year {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} twelve months.
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