We hadn’t met for 20 years, but I recognized her ____ I saw her.

We hadn’t met for 20 years, but I recognized her ____ I saw her.
A、the moment
B、for the moment
C、the moment when
D、at the moment when
【正确答案】：A
【题目解析】：定冠词the加上表示时间的名词起连词作用，引导时间状语从句。如the night/ the minute/ the spring/ the year等。