If you had come here early yesterday ,you could have watched this exhibition .

问题描述:

If you had come here early yesterday ,you could have watched this exhibition .
After all,it __ later
A rained B had rained C has rained

选择答案A,因为后面说的是过去所发生的客观事实翻译一下如果你昨天能够早点到的话,你就能看展览了。(事实上)毕竟,下雨了。(表示一种遗憾和体谅,因为下雨,所以耽误了行程)