I was so familiar with her that I recognized her voiceI picked up the phone.A. the moment

问题补充：

I was so familiar with her that I recognized her voiceI picked up the phone.

A. the moment

B. after

C. before

D. while

答案：

(答案→)A. the moment

B. after

C. before

D. while

解析：名词短语the moment 用作连词，相当于as soon as,引导时间状语从句，意为“一……就……”。类似用法的短语或词还有the minute，the instance，directly，immediately等。