Many people had some doubt ___ Bob could repair the trick .if 还是 whether

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Many people had some doubt ___ Bob could repair the trick .if 还是 whether

Many people had some doubt ___ Bob could repair the trick .if 还是 whether
Many people had some doubt ___ Bob could repair the trick .if 还是 whether

Many people had some doubt ___ Bob could repair the trick .if 还是 whether
whether这是同位语从句,只能用whether