The book is not mine.It's____.A.someone else B.someone else's C.someone elses' D.someone's else

问题描述:

The book is not mine.It's____.A.someone else B.someone else's C.someone elses' D.someone's else

The book is not mine.It's B.someone else's.
someone else's是一种所有格形式,意思是,别人的.