关于时态用法英语题Scientists have many theories about how the univers

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关于时态用法英语题
Scientists have many theories about how the universe_into being
A.came
B.was coming
C.had come
D.would come为什么选A啊,不是在陈述吗,怎么用过去时
THough part time jobs and sholarships,Tom_a political science degree from Yale University
A earns B earned
同样的疑惑,为什么这道题标准答案也是B过去时
I——here little more than a week when i set to work with scientist
Ahave been B had been
为什么,我选的A

第一科学家关于宇宙是如何形成的有很多理论,宇宙已经形成了.所以我们说这个动作已经发生,所以用一般过去时来表示.
第二通过兼职和拿奖学金,TOM拿到了耶鲁大学的学位
我们从句意可知,这里讲诉的是一个过去的已经发生的事情,用一般过去式A项的一般现在时表示习惯性的经常发生的动作.
第三在我开始与科学家一起工作之前,我已经在这里一星期多了
我们理解句意可知我与科学家工作这个动作已经发生（SET的过去式过去分词都是SET,这里表示过去式）,所以我在这里是发生在工作之前.所以用过去完成时

关于时态用法英语题Scientists have many theories about how the univers Scientists have many theories about how the universe ______i scientists have many theories about how the universe___into Scientists have many theories about how the universe into be Scientists have many theories about how the universe _______ Scientists have many theories about how the universe first c Scientists have many theories about how the universe ____int scientist have many theories about how the universe [ ]into scientists have many the ories about how the universe ---int Scientists have many theorise about how the universe ____ in Scientists have many theoyies about how the universe_____int 一道英语阅读题There are many theories about the beginning of drama