These are ___books.Li Lin bought some at the Sun Books tore and Jill bought some at the Blue Sky
问题描述：
These are ___books.Li Lin bought some at the Sun Books tore and Jill bought some at the Blue Sky
booksstore.A lI lin's and JIll B lI lin's and JIll 's ClI lin and JIll 's
答
Mary and John ’s books是指Mary 和 John两个人共同拥有的书.
而Mary ’s and John’s books是指Mary 的书和John的书.
结合语境 ,选C.