【问】
Their friendship developed well ____ they met at the party.
A. after B. since
答案：A
问题：since是“自从”，似乎也符合句意，为什么不对？
【答】
since的完整的含义是“自从…到…”，因为这个“到…”，所以since通常搭配完成时，具体又分为两种情况：“到现在”搭配现在完成时，“到过去”搭配过去完成时或一般过去时。
例：
- I’ve earned my own living since I was seven. 我自从7岁就自己谋生。（柯林斯）
- It was the hottest October since records began. 那是有记录以来最热的十月。（剑桥）
after是“在……后”，没有“直到现在”之类的含义，仅表达“过去”，所以after they met搭配过去时developed。
本题若用since，应改为：Their friendship has developed well since they met at the party.
