This is not my dictionary,it's____.(我姐姐的)She lent it to me this morning.

问题描述:

This is not my dictionary,it's____.(我姐姐的)She lent it to me this morning.
A my sister B my sisters C my sister‘s Dmy sisters'

C my sister‘s
应该用名词所有格.由She可以看出,应该用单数‘s