i don't know w____it is a fast train or not

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idon''tknoww____itisafasttrainornotidon''tknoww____itisafasttrainornotidon''tknoww____itisafasttrainorn

i don't know w____it is a fast train or not
i don't know w____it is a fast train or not

i don't know w____it is a fast train or not
whether
常跟or not连用

whether