It was never clear _why_ the man hadn"t reported the accident sooner.为什么这么填呢?

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It was never clear _why_ the man hadn
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It was never clear _why_ the man hadn"t reported the accident sooner.为什么这么填呢?
It was never clear _why_ the man hadn"t reported the accident sooner.为什么这么填呢?

It was never clear _why_ the man hadn"t reported the accident sooner.为什么这么填呢?
这里it为形式主语.真正的主语是后面why引导的名词性从句,在这里做主语.
你换一下句子顺序就知道了:
why the man hadn"t reported the accident sooner was never clear .
the man hadn"t reported the accident sooner已经是一个完整的句子
因此用了关系副词来连接,而用why也比较符合句意~

后置定语

句意通顺么

It(形式主语) was (系动词)never clear(表语) _why_ the man hadn"t reported the accident sooner(後面全部是真正主语)-------------所以,是主语从句。