[题目]Scientists have warned that coral reefs are likely to become the world’s first ecosystem because of global warming.A.to disappearB.disappearingC.disappearedD.having disappeared 题目和参考答案——青夏教育精英家教网—

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【题目】Scientists have warned that coral reefs are likely to become the world’s first ecosystem ______ because of global warming.

A.to disappearB.disappearingC.disappearedD.having disappeared

【答案】A

【解析】

考查非谓语动词。句意：科学家警告说，由于全球变暖，珊瑚礁很可能成为世界上第一个消失的生态系统。当被修饰词前有序数词修饰时，用不定式作后置定语，故A项正确。

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