鲨鱼在恐龙出世前就已经存在了.sharks（主语） are （系动词）amazing fish（表语） that （定语从句的连接词,也是定语从句的主语）have been around（谓语） since（时间状语从句的连接词） long before the dinosa...
sharks are amazing fish that have been around since long bef
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