______he got to know the ropes, there was nothing to stop him.
A、The moment
B、The moments
C、Moment
D、Moments
【正确答案】：A
【题目解析】：The moment名词短语引导时间状语从句，意为“一……就……”。类似的名词短语还有the minute，the instant，the day，the year，each time，every time，the next time，the last time，the first/second time等。
