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What it was to become was uncertain until between 4.5 and 3.

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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
What it was to become was uncertain until between 4.5 and 3.
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