【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(yǔ)動(dòng)詞。句意：科學(xué)家警告說(shuō)，由于全球變暖，珊瑚礁很可能成為世界上第一個(gè)消失的生態(tài)系統(tǒng)。當(dāng)被修飾詞前有序數(shù)詞修飾時(shí)，用不定式作后置定語(yǔ)，故A項(xiàng)正確。

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