About two thirds of the Earth's surface is covered by the seas ___ are home to millions of species of plants and animals
问题描述：
About two thirds of the Earth's surface is covered by the seas ___ are home to millions of species of plants and animals.
A.where B.which C.in which D.for which
不确定是否是选C ,另外为什么 home的前面是are
答
选B.which 因为这里是做从句的主语,不是状语
seas are homes...
因为定语u从句的谓语要和主语一致,所以用are这个句子的home为什么不是复数呢，原题中的这个home没有复数是不是不对呀？