These books are my______.B.student's C.students' 为什么不能选B

These are ()() my books. Are these books ( )(your)? These books are _____. Are these books all yours? 改错：These are ours books These are the__(students)books John,are these books----(your) These are ( )(她的)books Are these students' books?对错 These books are distributed freely. these are (they)books.those are (your) These are her books.These books areThese are her books.These books are (填完整,改同义句) these are 后面要加some吗?如these are some books还是these are books these are english books .—— are chinese books. Are they your books?还是Are these your books?为什么? These are Chinese books.They are (we)books. are these blue books ______?no,my books are red what are these?these are books.哪里错了