Scientists have many theories about how the universe into being. A. came B. was
来源：网络
时间：
推荐文章
Scientistshave many theories about how the universe ___ into being.
A.came B. was coming
C. hadcome D. would come
试题答案
【答案】
A。
【解析】考查时态的用法。宇宙是如何形成的，因为宇宙的形成这个动作已经发生，所以用一般过去时来表示已经发生的动作。