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题型：语法填空（单句） 题类：常考题 难易度：容易
人教版初中英语九年级Unit 8 Have you read Treasure Island yet Section B 2a-2e 练习
—Yes, it's well worth ________.
Serious action must be taken to{#blank#}1{#/blank#} people{#blank#}2{#/blank#} {#blank#}3{#/blank#} endangered animals.
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