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题型：语法填空（单句） 题类：常考题 难易度：普通
人教版（新课程标准）2018~2019学年高中英语必修一Unit1 Friendship 训练卷（一）
Social class matters a lot {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} it used to.
The environment around can {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} your mental health.
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