高中语法问题1. It's still a complete mystery_____ caused the accid

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高中语法问题
1. It's still a complete mystery_____ caused the accident.
为什么填what
2. Please put the book (in the place) where it was 请分析一下这个句子,为什么这么填.

1.句中it是形式主语,代替what引出的从句,what引出的从句做句子真正主语.
译：事故的原因仍然是个谜.
2.where 引出状语从句,表示地点.
译：请把书放回原处.
又如：There is always laughter where she is.她到哪里哪里有笑声.

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