--The train has just arrived.--Really?i have waited forone hour.

问题描述:

--The train has just arrived.--Really?i have waited forone hour.

过去完成时态,是表示在过去的某个时间点已经完成的动作.也就是说要有一个过去的时间点来做参照.这里面没有.所以用现在完成时态,表示火车刚刚到达.