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题型：语法填空（单句） 题类：常考题 难易度：容易
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组卷次数：16次 +选题
—I heard him ____with our English teacher when I passed the teachers' office.
—It's great, too.
Serious action must be taken to{#blank#}1{#/blank#} people{#blank#}2{#/blank#} {#blank#}3{#/blank#} endangered animals.
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