He____today,but he was asked to study for another week.

题目

He____today,but he was asked to study for another week.
a.was to have returned b.were to return c.had returned d.is going to return
A和D有什么区别?

答案

A 是过去将来式（本来应该回来的,表过去）,D是一般将来时（表没发生）,这里后面有was asked,所以选A