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.

 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

【申友解析】

正确答案：A

A. 正确
B. had done动词形式错误
C. 改变原句合理的逻辑主语
D. 宾语从句that省略，导致句子结构不完整
E. 宾语从句that省略，导致句子结构不完整