读这篇英语文章回答一个问题（初二水平）

读这篇英语文章回答一个问题（初二水平）
There were many mice in Jack's house.They ran about all over the house at night.In the day,they were bace to their homes.
"What I need is a good cat,"thought Jack.He know a man who had cats,so Jack went to the man's home.
"Do you have a cat that is good for mice?"Jack asked the man.
"Well,yes,I happen to have such a cat,"answer the man.
"I'll take it,"said Jack.He paid for the cat and took it home.A week later,Jack went back to the man with the cat in his hand.
"My house has more mice than before,"Jack said angrily."The cat you sold me didn't want to catch them at all."You said it was good for the mice."
"That's right,"said the man."It is good for the mice.Come to think aboutit-it was good for mice."
Question:Did the man understand Jack?
我认为是Yes.因为这个男的说Come to think aboutit-it was good for mice.明显的是奸商，但老师说是NO……