--When are you going on the school trip?--_____today or tomorrow.We'll be free these days.A.Either B.None C.both D.neither为什么其他3个不行?

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--When are you going on the school trip?--_____today or tomorrow.We'll be free these days.A.Either B.None C.both D.neither为什么其他3个不行?
--When are you going on the school trip?
--_____today or tomorrow.We'll be free these days.
A.Either B.None C.both D.neither
为什么其他3个不行?

--When are you going on the school trip?--_____today or tomorrow.We'll be free these days.A.Either B.None C.both D.neither为什么其他3个不行?
Either...or.:不是...就是,要么...要么
要么今天或者明天

either or
neither nor
both...
none of...

两者,用both, either, neither
这三个中,是由either可以与or搭配
both与and搭配,neither与nor搭配

简单地说,是either...or 的固定搭配: 或者...或者...(你们什么时候进行学校旅行? 今天或者明天.我们这些天都有空.