What it was to become was uncertain until between 4.5 and 3.8 bil_英语解答

What it was to become was uncertain until between 4.5 and 3.8 billion years when the dust settled
into a solid globe.
when引导的这个从句是什么句子?

人气：179 ℃　时间：2020-06-13 01:18:19

解答

时间状语从句.
接在4.5 and 3.8 billion years 后,表示在这个时间尘埃落定后,一切明朗之类的.