you are suppposed --------the work yesterday but you forget.为什么用to have finished

题目

you are suppposed --------the work yesterday but you forget.为什么用to have finished

答案

首先BE SUPPOSED TO DO STH是固定搭配,根据句中的时间状语提示YESTERDAY,可知道事情已经发生,所以用HAVE DONE的形式,也就是HAVE FINISHED.
所以,根据回答可知道语句的意思是,你本应该昨天就完成这项工作的但是你忘了.很明显,BE SUPPOSED TO 有责备的意思,所以BE SUPPOSED TO 的意思就是本应该做``````` 但是没有做.