-----------------------------?That cat is Lucy's.

-----------------------------?That cat is Lucy's.
-----------------------------?That cat is Lucy's.

-----------------------------?That cat is Lucy's.
Whose cat is it?

whose cat is it？

Where my English books?
There are ---C--- the shelf.
A. at B. in C. on

很高兴为您
whose cat is it？
希望我的回答对您有帮助，祝您学习进步，工作顺心。^_^