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what she wants to know is which dress she should buy

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what she wants to know is which dress she should buy
是个什么从句,并帮我分析下
主语从句还是表语从句?
what she wants to know is which dress she should buy
主语从句,及表语从句.
(what she wants to know)is [which dress she should buy].
()中的完整句子作为后面句子的主语,叫做主语从句.
[]中的完整句子,作为系动词is的表语,叫做表语从句.
译为:她想知道的是她该买哪条裙子.
所以,本句存在两个从句.主语和表语均用从句表示.