It's still a puzzle how he became rich overnight.
=How he became rich overnight is still a puzzle
参考疑问:他是如何一夜暴富仍然是一个谜。
句子语法结构分析如下
主语:How he became rich overnight
系动词:is
表语:a puzzle
(备注:以上it为形式主语,真正主语为how引导主语从句)
解答如下:
正确答案为"how" 为连接副词how引导的主语从句
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