题目

一道英语单选题,请解析
According to the research,was once considered rare and healthy food is no more than something ordinary.
A．that B．whether C．all D．what

提问时间：2021-03-24

答案

According to the research,was once considered rare and healthy food is no more than something ordinary.
A．that B．whether C．all D．what
选D.　what was once considered rare and healthy food 是主语从句,因为从句中缺少consider的宾语,所以用what来引导.what在从句中当（被动语态）主语.