问题
选择题
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
答案
答案：A
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。