【題目】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】

考查非謂語動詞。句意：科學(xué)家警告說，由于全球變暖，珊瑚礁很可能成為世界上第一個消失的生態(tài)系統(tǒng)。當(dāng)被修飾詞前有序數(shù)詞修飾時，用不定式作后置定語，故A項正確。

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