随后它会变成什么曾经是一个迷, 直到最后这团尘埃开始慢慢地合成一个环绕太阳运转的球状物.
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随后它会变成什么曾经是一个迷, 直到最后这团尘埃开始慢慢地合成一个环绕太阳运转的球状物。（combine into ）
试题答案
What it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun.