i am not sure-----her sister will come here or stay at home

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i am not sure-----her sister will come here or stay at home .a.whether b.when c.what d.where

a.whether
whether or固定搭配
再问：不是whether or not固定搭配吗
再答：不一定非要加Not 两种情况 whether he is a student or not whether he is a student or teacher 只是根据表达的需要灵活对待而已

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