Are you a teacher?- I but now I am working in a company.A. isB. 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：考查时态。句意：你是一位老师吗？我以前是，现在我在一家公司上班。根据语境是老师动作在过去，所以用一般过去式。选C。