问题描述: (共40题、总分40分)1.( ) some mammals came to live in the sea is not known (本题分 1个回答 分类:英语 2014-10-05 问题解答: 我来补答 When最好.如果填whether或if搭配or not.Where后面已经有in the sea.Who不对,已经 有mammals. 展开全文阅读