从句what 和whenleif followed biarni's directions and sailed to what is believed to be the coast of present-day canada.此句中的waht作主语,可是为什么不能用where呢?

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从句what和whenleiffollowedbiarni''sdirectionsandsailedtowhatisbelievedtobethecoastofpresent-daycanada.此句

从句what 和whenleif followed biarni's directions and sailed to what is believed to be the coast of present-day canada.此句中的waht作主语,可是为什么不能用where呢?
从句what 和when
leif followed biarni's directions and sailed to what is believed to be the coast of present-day canada.
此句中的waht作主语,可是为什么不能用where呢?

从句what 和whenleif followed biarni's directions and sailed to what is believed to be the coast of present-day canada.此句中的waht作主语,可是为什么不能用where呢?
what就是that where
what要在句子里充当成分的
where不行

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