I am not sure ( )there are living things on other plants or

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?

zippfeng 1年前已收到4个回答举报

王者之风笑笑幼苗

共回答了17个问题采纳率：82.4% 举报

or not不能和if连用,只能用whethe

1年前

落叶归天幼苗

共回答了31个问题举报

在条件状语从句当中，whether常常与or not连用，翻译成是否。

1年前

khyyf 幼苗

共回答了14个问题举报

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 ..

1年前

米高仔幼苗

共回答了1个问题举报

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）

1年前

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