单项选择题
W: Is that your dog He’s been digging up my flowers and chasing my cat.
M: It is my dog, but you must be mistaken. We keep him in the house all the time, except when we walk him in the park. There must be another dog that looks like him.
A. There was another cat that looks like him.
B. She had mistaken it for his dog.
C. He never let the dog out on his own.
D. The dog liked to walk in the park.