The population of our country is now more than three times what为什么用what

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The population of our country is now more than three times what为什么用what

名词性从句(主语、宾语、表语、同位语从句)的主语、宾语、表语都用what.is后是表语从句,全句应是what it used to be ,what在从句中作be的表语.

what 做兼语,既是前面句子的宾语又是后面句子的主语。

我已经查过了,按本人理解,应该是作副词,表示"到什么程度"