I don't know ______to join the army or to find a job after graduation.答案选的是whether,想请问if为什么不对?

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I don't know ______to join the army or to find a job after graduation.
答案选的是whether,想请问if为什么不对?

whether和or都能引导宾语从句,且意思一样,但是如果句子中有 OR,出现时,则多用 whether,因为 whether or 是个常用句型.

I don't know. “i don't know you know i don't know sorry,I don't know. i don`t know much I don't really know. 英语；I don't know I don't know miss I don't know him. I don't know now 翻译 i don't know So know,I don't I don't know her i don't know anything I know enough to know that I don't know i don't know what i I don't think I know you I don’t no I don't know I don't knw I don't know翻译中文,