Scientists have many theories about how the universe into being. A. came B. was

Scientists have many theories about how the universe ___ into being.
A. came      B. was coming
C. had come   D. would come

试题答案

A

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。