Although we hadn’t met for twenty years I recognized him I saw him.A. the momentB. one

问题补充：

Although we hadn’t met for twenty years, I recognized him I saw him.

A. the moment

B. one moment

C. by the moment

D. for the moment

答案：

(答案→)A. the moment

B. one moment

C. by the moment

D. for the moment

解析：the moment引导时间状语从句,意为“一……就 ……”。