请教英语题,语法A good many proposals were raised by delegates,as was to _英语解答

请教英语题,语法
A good many proposals were raised by delegates,as was to be expected.为什么用was to be expected而不是was expected.

人气：312 ℃　时间：2020-04-20 14:20:22

解答

as was expected 我觉得在语法上是没有错的.
我的想法是,可能是用了一个be to do结构,来表达这样一种意思：代表团提出一些议案是必然会发生的事情,是预料中的,对于按计划、时间表等必然会发生的事情,可以用be to do来表达这个意思.如the train is to leave at 10.