she knows that what children learn from books is useless中what做宾语但引导主语从句是什么意思

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she knows that what children learn from books is useless中what做宾语但引导主语从句是什么意思

that后面是宾语从句,但是这个宾语从句的主语是what引导的句子,句子作主语就是主语从句

做know 的宾语,
what children learn from books 是主语从句,is useless是表语