“Is your father a doctor?”“ No he isn’t. He is office worker.”A. a B. an C. the

问题补充：

“Is your father a doctor?”“ No, he isn’t. He is office worker.”

A. a B. an C. the

答案：

解析：表示事物类别，在名词前通常用不定冠词，元音音素前用an，office第一个音是元音，故用an，故本题选B。