－Hi Tom. Is this your dog?－No it’s Cathy’sis at home now. A. MineB. MyC. HersD. Her

问题补充：

－Hi, Tom. Is this your dog?

－No, it’s Cathy’s. is at home now.

A. Mine

B. My

C. Hers

D. Her

答案：

(答案→)A. Mine

B. My

C. Hers

D. Her

解析：表示事物所属关系的名词用名词性物主代词，本题所代指的事物为我的狗，故用名词性物主代词mine，故本题选A。