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题型:单选题 题类:常考题 难易度:普通

内蒙古自治区赤峰二中2019-2020学年高二上学期英语第一次月考试卷

Scientists have warned that coral reefs are likely to become the world's first ecosystem      because of global warming.
A、to disappear B、disappearing C、disappeared D、having disappeared
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