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题型：单选题 题类：常考题 难易度：普通
牛津上海（本地版）五四制初中英语九年级上册期末拓展提高卷（含听力材料）
—Oh? I'm not sure. But there ______ be something important happening.
Houses, schools and hospitals will {#blank#}1{#/blank#} {#blank#}2{#/blank#} on Mars one day .
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