Scientists have many theories about how the universe _______ into being .为什么选B?
Scientists have many theories about how the universe _______ into being .
A.cameB.was comingC.had comeD.would come
是因为宇宙是从很久以前开始形成的,所以用过去式吗?
was coming能表示从过去开始并且一直持续到现在的事情吗?
麻烦详细讲一下,谢谢!