一道语法英语题

问题描述:

一道语法英语题
as a student,each of us shoud study -----possible
a,harderthan b,sohard as
c,as hardly as d,as hardas
讲解清楚

D
as …… as possible固定搭配,意思是尽可能……
hard可以当副词,hardly意思是几乎不……