求助og1 6sc＃137～～

hermionezc · 发表于 2016-7-13 08:11:25

137. By 1999, astronomers had discovered 17 nearby stars that are orbited by planets

about the size of Jupiter.

(A) had discovered 17 nearby stars that are orbited by planets

(B) had discovered 17 nearby stars with planets orbiting them that were

(C) had discovered that there were 17 nearby stars that were orbited by

planets

(D) have discovered 17 nearby stars with planets orbiting them that are

(E) have discovered that 17 nearby stars are orbited by planets

答案是a.

想知道e为什么不可以呢？还是不太理解关于时态的问题为什么现在完成时就不可以呢？

以及，有看到别的帖子说，e选项改变了句子意思，那为什么a的意思就是对的呢？

万分感谢！！！！

devilmars · 发表于 2016-7-13 13:16:06

时间顺序上 discover<1999<now，所以discover在和1999作比较以及1999是过去的时间，那么时态就用过去完成时
至于句子意思，A和E这两个discover强调的内容不一样，倒不是说谁对谁错，而是如果原文没有问题的情况下，强行更改原文意思这个行为是不对的。

hermionezc · 发表于 2016-7-13 20:04:11

devilmars 发表于 2016-7-13 13:16
时间顺序上 discover

明白了～～～太感谢！！！！

Nievesma · 发表于 2016-7-13 22:45:13

赞同devilmars，by now 的话可以用现在完成时，但是by 1999， 1999本来就是个过去的时间了，所以要用过去完成时

hermionezc · 发表于 2016-7-14 05:02:25

Nievesma 发表于 2016-7-13 22:45
赞同devilmars，by now 的话可以用现在完成时，但是by 1999， 1999本来就是个过去的时间了，所以要用过去完 ...

明白了十分感谢！！～～～

kennichan2011 · 发表于 2016-10-14 01:18:44

错错错！选A是因为 are 表示客观事实不能用过去式

[SC悬赏令] 求助og1 6sc＃137～～