Scientists have many theories about how the universe _______ into being 为什么此处要用was coming 而不用would come

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• Scientists have many theories about how the universe _______ into being 为什么此处要用was coming 而不用would come
• Scientists have many theories about how the universe _______ into being 为什么此处要用was coming 而不用would come最好具体一些
• Scientists have many theoyies about how the universe_____into being.A.came B.was coming c.had come D.would come
• 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.came B.was coming C.had come D.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!
• scientists have many theories about how the universe___into being.A.came B.was comingscientists have many theories about how the universe___into being.A.cameB.was comingC.had comeD.would come为什么不用comes不是客观事实嘛?、
• scientists have many theories about how the universe___into being.A.came B.was coming
• don't stand in my w——move out!