—Were you at school when it began to rain? —Yes. I with my teacher at that time. A. talk B

问题补充：

—Were you at school when it began to rain?

—Yes. I with my teacher at that time.

A. talk

B. will talk

C. was talking

D. am talking

答案：

A. talk

B. will talk

(答案→)C. was talking

D. am talking

解析：问句为过去时，从句通常也为过去时，选项中只有C项为过去时，故选C。