she is on __diet,for she is trying to lose weightA.aB./为什么用Aon a dieton diet 有什么区别

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she is on __diet,for she is trying to lose weightA.aB./为什么用Aon a dieton diet 有什么区别
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

she is on __diet,for she is trying to lose weightA.aB./为什么用Aon a dieton diet 有什么区别
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,多用于口语或非正式场合.
It is always not easy to get on diet. 节食减肥却不是那么容易.