名词所有格的用法 — 英语选择题
题目
在英语角活动中，交换生 Jack 问你下面哪个句子完全正确。请选出正确的一项：A. This is Tom's and Mary's room, and it is theirs. B. These are Tom and Mary's books, and they are Tom's and Mary's. C. Tom's and Mary's rooms are on the second floor, and they are theirs. D. Tom and Mary's rooms are on the second floor, and it is theirs.