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求助一道从句语法题.He finds his mother has changed a lot,quite differ

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求助一道从句语法题.
He finds his mother has changed a lot,quite different from ____ she was five years ago.
A.who B.that C.how D.what
D
但是,我想知道这是什么考点?表语从句?
ABC三项不选的原因.以及为什么选择D.
D.what为正确选项.
what引导的宾语从句what she was five years ago做介词from的宾语.
考点是what引导的宾语从句与that引导的定语从句的区别.它们最大的区别是what引导的宾语从句没有先行词(即被修饰的名词或代词).如有先行词,则要考虑是否是定语从句.
本题很容易出现选 B.that的错误.这里没有先行词,故不是定语从句,不能选that.how who更加不对.