单选题 Coral formations have known as fringing reefs are located close to shore, separated from land only by shallow water.

【正确答案】 A

【答案解析】答案：A 分析：A应改为known。整个句子的谓语是are located， known as fringing reefs是分词短语作定语。改正：have known → known 翻译参考：作为边缘礁石而被认知的珊瑚礁坐落于海边,仅仅通过浅水与大陆隔离。