从句what 和when

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/09 17:44:00

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?

what就是that where
what要在句子里充当成分的
where不行

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