【求助】whether...or whether的语法问题

请问这里的I am not sure whether I was struck or whether I just fell.是个什么表达,如果说whether…or…是一个连词,那么whether…or whether也是吗

这是 or 在外层做连词,并不是whether结构的一部分,牛九 whether 词条下就有这样的例子:

1.He seemed undecided whether to go or stay.

2.I asked him whether he had done it all himself or whether someone had helped him.

谢谢,我明白了

出处:Fowler’s Dictionary of Modern English Usage

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