This book is not mine May be [ 〕 A someone's else Bsomeone else's选哪个,为什么

问题描述:

This book is not mine May be [ 〕 A someone's else Bsomeone else's选哪个,为什么

B 当someone和else组合变所有格时,要在else后加撇s,其它的也一样,好anything else's
somebody else's