单项选择题
Questions 19 to 22 are based on the conversation you have just heard.
What does the man say about his working experience? （）
A．He has taught Spanish for a couple of years at a local school.
B．He worked at the Brownstone Company for several years.
C．He owned a small retail business in Michigan years ago.
D．He has been working part-time in a school near Detroit.