Scientists have many theories about how the universe ________ into being.

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问题 Scientists have many theories about how the universe ________ into being.

选项 A、came
B、was coming
C、had come
D、would come

答案A

解析 考查时态的用法。因为“宇宙的形成”这个动作已经发生,可以用一般过去时表示已经发生的动作。句意:科学家们对宇宙是如何形成的有许多理论。
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