Scientists have many theories about how ...

Scientists have many theories about how the universe_____.

A．came into being	B．was coming into being
C．had come into being	D．would come into being

A 【解析】考察时态。根据句意可知宇宙的形成是过去发生的，使用过去时。句意：关于宇宙是如何形成的，科学家有很多的理论。

考点分析：

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