It worried Jim a lot____he would pass the final examinnation

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It worried Jim a lot____he would pass the final examinnation.a.if b.whether c.how d.that
..为什么是whether?T T if和whether我总是搞不清,请老师指教,

if 引导的名词性从句只能跟在及物动词后面做宾语.
whether适用于几乎所有情况.
I doubt whether/if he will come.
除了这种两种通用,其他基本都用whether
所以2选1的话,选whether 都对.
希望对你有用,不懂追问.如果有帮助,请及时采纳.
再问：这句是主语从句，请问从哪看出来是主语从句了? 一般什么情况只能选if呢? 谢谢
再答：我晕了，如果你连主语从句都看不出来，研究whether、if区别，是不是太超前了。这句话it 是形式主语，真正的主语当然是whether从句了。没有只能选if的情况，除非是条件状语从句，翻译成如果。

It worried me a lot _______ I would pass the exam. A:Tom failed the final exam.B:I don't think he could pass it He didn’t pass the final examination.He ______ it.选项:a、must He didn’t pass the final examination.He ______ it. He didn't pass the final examination.He _______ it. he failed ----- the final exam A.to pass B passing If I ____ english hard,I would pass the final exam. He is ___about the final exam.选择A worry B worried C worrying I was not a bit worried about the final exam because I alway she didn‘t pass the final exam Would you please _____ to Tom? A pass it on B pass on it C p Would you please pass me the book? A、Pass you. B、Yes,I would