I am not sure ( )there are living things on other plants or not.Even scientists are not sure.A.if B.that C.whether D.where为什么不可以选A有什么结构吗?

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I am not sure ( )there are living things on other plants or not.Even scientists are not sure.A.if B.that C.whether D.where为什么不可以选A有什么结构吗?
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I am not sure ( )there are living things on other plants or not.Even scientists are not sure.A.if B.that C.whether D.where为什么不可以选A有什么结构吗?
I am not sure ( )there are living things on other plants or not.Even scientists are not sure.
A.if B.that C.whether D.where
为什么不可以选A有什么结构吗?

I am not sure ( )there are living things on other plants or not.Even scientists are not sure.A.if B.that C.whether D.where为什么不可以选A有什么结构吗?
or not不能和if连用,只能用whether

在条件状语从句当中，whether常常与or not连用，翻译成是否。

传统语法中：whether or not 是固定句型 如果选if后面的or not去掉
但是实际上现在大多数默认if也是可以和or not 连用的（美式英语or口语中）

当然选A啦你看后面有ro not whether or not才能连用，if没有这种用法的 祝你快乐：） A 句中有 or not时只能用whether ,不能用if A ..

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