What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a soild globe 还有 What it was to become是什么从句,在句子中,做什么成分
问题描述：
What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a soild globe 还有 What it was to become是什么从句,在句子中,做什么成分
答
What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a soild globe .
一切都是不确定的，直到4.5至3800000000年前，当宇宙尘埃形成固体地球.
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答
What it was to become 是这个句子的主语部分。what 在此引导一个主语从句，同时what 又在该从句中做了become的表语。它将要变成什么。
what he said made me sad.
答
What it was to become是主语从句,在句子中充当主语
这究竟会变争什么样还不确定直到距今38亿至45亿年前当它成为一个固体的圆球
这是课文吧关于生物进化史的,这一句讲讲地球的形成