问题补充:
―Hello! May I speak to Jack, please?
―Yes, speaking.
―Oh, I your voice at first.
A. don’t recognize
B. didn’t
C. hadn’t recognized
D. haven’t recognized
答案:
A. don’t recognize
(答案→)B. didn’t
C. hadn’t recognized
D. haven’t recognized
解析:说话的时候已经听出来是Jack的声音,“没听出来”是说话前的动作,用过去时。