Sentence Correction

试题详情

题目:

The widely accepted big bang theory holds that the universe began in an explosive instant ten to twenty billion years ago and has been expanding ever since.

选项:

A、that the universe began in an explosive instant ten to twenty billion years ago and has been expanding
B、that the universe had begun in an explosive instant ten to twenty billion years ago and had been expanding
C、that the beginning of the universe was an explosive instant ten to twenty billion years ago that has expanded
D、the beginning of the universe to have been an explosive instant ten to twenty billion years ago that is expanding
E、the universe to have begun in an explosive instant ten to twenty billion years ago and has been expanding

答案:

A

提问:

答案A,我选的B,因为觉得A前后时态不一致,请问老师是不是begin任何时候都不能用完成时,只能用过去式呢?
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提问:

我选的B选项,请老师讲一下b时态问题是什么?我觉得用had begun 和had been也可以,谢谢老师
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提问:

我排除了BCD, 犹豫了A和E,我最后选了E,我不懂为什么A是对的。OG后面解释说他的时态都对,我没懂,请老师帮忙解答。谢谢
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