问大家一道语法题,,,后天一战了

alexnerohero

The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.

A.that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding

B.that the universe had begun in an explosive instant 10 to 20 billion years ago and had been expanding

C.that the beginning of the universe was an explosive instant 10 to 20 billion years ago that has expanded

D.the beginning of the universe to have been an explosive instant 10 to 20 billion years ago that is expanding
E.the universe to have begun in an explosive instant 10 to 20 billion years ago and has been expanding
 答案是A,,,,我想不通的是and 连接的话 前后时态难道不用一致吗,,,A前面过去时,,,后面完成时,,,所以我选了B

BeBrave2011

完成时是要持续了一段时间的动作。began这个动作是一个time point的事，不能用完成时。
后面一个用现在完成时是因为"ever since"(这个也是完成时标志性的状语), expand这个动作从universe began一直持续到现在。
有的时候为了表示动作发生的时间的先后顺序，不需要一致的时态。你可以搜一下有过去完成时的OG题就知道了。