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 returnA和D有什么区别?
问题描述：
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
a.
主句 he was asked 是过去时，因此是a. 如果主句是现在时，为d
答
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