Has Mary come back yet?Yes. She has got many books from her elder schoolmates and

问题补充：

--- Has Mary come back yet?

--- Yes. She has got many books from her elder schoolmates, and the number 1000.

A. adds up

B. adds up to

C. add to

D. add up to

答案：

A. adds up

(答案→)B. adds up to

C. add to

D. add up to

解析：这题考查词义辨析：add up加起来，adds up to共计是， add to增加，句意是：--玛丽回来了吗？--是的，她从学长那里得到很多书，数量共计有1000.选B。