He is not ----he used to be .(用that 还是what)解释

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He is not ----he used to be .(用that 还是what)解释

用what.what是一个连接代词,作为连词引出表语从句,作为代词做从句的表语.that在引导名词性从句时充当的是纯粹连词,也就是说在从句中不能做成分,这样,从句中be之后缺少表语.不妨这样记忆:what 相当于两个词:名词+th...