she is on __diet,for she is trying to lose weight

题目

she is on __diet,for she is trying to lose weight
A.a
B./
为什么用A
on a diet
on diet 有什么区别

答案

go on a diet /be on a diet " 吃某种特殊饮食,节食 ", 这是固定搭配. You must go on a diet because you are too fat. 你必须限定饮食因为你太胖了. 也有on diet的说法,是由on a diet 省略而来,多用于口语或非...