—Hi Peter. Long time no see. —Oh it’s you Jack. I’m sorry I didn’t you at first. A. knowB

问题补充：

—Hi，Peter. Long time no see.

—Oh，it’s you，Jack. I’m sorry I didn’t you at first.

A. know

B. recognize

C. remember

D. realize

答案：

A. know

(答案→)B. recognize

C. remember

D. realize

解析：本题考查动词辨析。know知道，recognize认出，remember记住，realize意识到，句意：对不起，我开始没有认出你来。所以选B。