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题型：单选题 题类：模拟题 难易度：普通
辽宁省鞍山市第二十中学2017届九年级中考英语模拟考试试卷
—I don't think _____________________.
— We're certain ____ something is wrong with him, but we are not sure ____ the disease can kill him.
{#blank#}1{#/blank#} you have to work {#blank#}2{#/blank#}.
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