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What it was so become was uncertain until between 4.5 and 3.8 billion years ago when the dust
settled into a solid globe.请问when在这里引导的是什么从句?为什么?
人气:426 ℃ 时间:2020-05-20 16:31:07
解答
是状语从句,when引导的从句修饰4.5 and 3.8 billion years ago
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