OG12 SC8 求助！！！！

Vivian21

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
我选的是B  答案是A  
我就是搞不懂A中的began和has been expanding怎么能并行并列呢？

zhongshanlh

虽然and前后一般要求时态 形势等的平行，但是在本题中 and前后分别指出了时间发生的时间状语ten to twenty
billion years ago 和 ever since，所以这种情况下，and前后的动词时态根据自己的时间状语判断即可。
个人理解，求指正

HarrisZheng

一般过去时和现在完成进行时并列是一种很常见的用法

强调过去某个时间点发生并产生持续影响的状态

I started my journey on GMAT 3 month ago and have been preparing for the test since.

Vivian21

虽然and前后一般要求时态 形势等的平行，但是在本题中 and前后分别指出了时间发生的时间状语ten to twenty
billion years ago 和 ever since，所以这种情况下，and前后的动词时态根据自己的时间状语判断即可。
个人理解，求指正

-- by 会员 zhongshanlh (2011/12/8 16:13:31)

明白点了  谢谢

Vivian21

一般过去时和现在完成进行时并列是一种很常见的用法

强调过去某个时间点发生并产生持续影响的状态

I started my journey on GMAT 3 month ago and have been preparing for the test since.

-- by 会员 HarrisZheng (2011/12/8 20:57:49)

强调过去某个时间点发生并产生持续影响的状态

这样说就懂了，举的例子也很好，十分感谢！