Question

2.  ( 2015 天津，38.★ ☆ ☆ ) —Why did the car hit the boy?

   —Because the driver on the phone at that time.

   A. talk         B. is talking

   C. was talking   D. have talked

Answer 1

2. C由句意和时间状语at that time可推知此处表示过去某时 刻正在进行的动作，用过去进行时。