—Are you a teacher?—I but now I am working in a company.A. is B. amC. wasD. had

问题补充：

—Are you a teacher?

—I , but now I am working in a company.

A. is

B. am

C. was

D. had

答案：

A. is

B. am

(答案→)C. was

D. had

解析：这时用一般过去时表示过去曾经是老师，但现在不是了。