____ we’d arrived there we had a wonderful time.

____ we’d arrived there we had a wonderful time.
A、Only
B、Once
C、one time
D、one more
【正确答案】：B
【题目解析】：once是连词“一旦”,引导条件状语从句,因为这个从句和后面的主句存在条件关系.而as表示时间或因果关系,