Scientists have many theories about how the universe .
A. came into being
B. was ing into being
C. had e into being
D. would e into being
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(答案→)A. came into being
B. was ing into being
C. had e into being
D. would e into being
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。