Mr. Smith moved to another town, and soon he needed a new doctor, so he went to see one. He sat down in the waiting room and looked around. The doctor's degrees (学位证书) were on the wall. Suddenly Mr. Smith remembered: there had been a classmate with the same name in his class at school, and he had become a doctor.
As he went to see the doctor, he remembered a young handsome student, and was sad to see how old and heavy(迟钝的)and grey(头发花白的)this man looked. He said to him, "Good Morning, doctor. Did you go to King High School？"
The doctor answered, "Yes, I did."
"Were you there from 1942 to 1946？" Mr. Smith asked.
"Yes, I was," the doctor answered. "How did you know？"
Mr. Smith laughed and said, "You were in my class!"
"Oh？" the doctor said and looked at him carefully for a moment. "What were you teaching？"
Mr. Smith ______, so he needed a doctor.

A. visited a town
B. went to live in another town
C. went away from a town