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
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

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