-Mary are these your bags?-- A. Yes there areB. Yes they’reC. Yes they areD. Ye

问题补充：

---- Mary, are these your bags?

----

A. Yes, there are

B. Yes, they’re

C. Yes, they are

D. Yes, there’re

答案：

A. Yes, there are

B. Yes, they’re

(答案→)C. Yes, they are

D. Yes, there’re

解析：句意：玛丽，这些是你的包吗？是的，他们是。对these are的回答，应该用they are。且，不用缩写形式。