Scientists have many theories about how the universe . A．came into being B．was c
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Scientists have many theories about how theuniverse_____.
| A．came into being | B．was coming into being |
| C．had come into being | D．would come into being |
试题答案
【答案】
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。