【HELP】TTGWD4-Q39---时态问题

fannybeibei

Unearthed in China, fossils of feathered dinosaurs offer the most dramatic evidence yet discovered of the close evolutionary relationship between dinosaurs and birds.
A. offer the most dramatic evidence yet discovered of the close evolutionary relationship between dinosaurs and birds
B. offer evidence more dramatic than what has yet been discovered of the close evolutionary relationship between dinosaurs and birds
C. offer more dramatic evidence of the close evolutionary relationship than any yet discovered between dinosaurs and birds
D. have offered the most dramatic evidence of the close evolutionary relationship between dinosaurs and birds
E. have offered more dramatic evidence than any that has yet been discovered of the close evolutionary relationship


请问为什么不是D呢？fossils提供了很好的evidence，而且这个evidence对至今的科学研究还有影响，看了帖子，同学挺坚定的说D时态不对，可我觉得完成时态这个问题并没这么绝对。请看下面两个就是用完成时的。

比如OG
68The first trenches cut into a 500-acre site at Tell Hamoukar,Syria, have yielded strongevidence that centrally administered complex societies in northern regions of the Middle East arose simultaneously with but independently of the more celebrated city-states of southern Mesopotamia,in what is now southern Iraq
.

128.Australian embryologists have foundevidenceto suggest that the elephant is descended from an aquatic animal and that its trunk originally evolved as a kind of snorkel.


而且A的yet不是用在完成时态里，we have not found the clue yet.这样的么？怎么可以用在一般现在时里呢？

求指教！

fly12404

A&D 差在D 省去了yet discovered
在這yet 為adv  表 尚未 還 仍然
很明顯這樣D&A句意就有所不同了
A 是表示在未發現的close evolutionary relationship, fossil給了很大的證明
而D卻是表示已發現的close evolutionary relationship, fossil給了很大的證據
應該有感覺到差距！
依照題意盡量不變原則
我想A preferable

fannybeibei

呵呵，又看到fly了～～～
懂了，谢谢哦

fly12404

: )
哈...很常來逛逛呢
最近還在趕工ｐｐ　
ｇｗｄ都還沒開始
要認真點了＞＜

fannybeibei

In 1926, in her second attempt to swim across the English Channel, Gertrude Ederle not only crossed the Channel against currents that forced her to swim thirty-five miles instead of the minimal twenty-one, but also set a record for speed, swimming the distance almost two hours faster than anyone had yet done.

那这句的than anyone had yet done.
是指“C游的时间少了2个小时，跟别人已游的相比”
还是“C游的时间少了2个小时，跟别人还未游出的水平相比”呢？

sonic623

yet在這裡指的是「迄今為止」，等同於until now/then以及so far，必須與最高級連用，「後位」修飾比較級。Longman字典是這樣解釋的：

the biggest/worst etc (something) yet
used to say that something is the biggest, worst etc of its kind that has existed up to now: This could turn out to be our biggest mistake yet.
Nordstrom’s latest novel looks like his best yet.



補充yet的另一個用法，當yet與比較級連用時，yet=even=still，「前位」修飾比較級表示「更為」、「還」
Longman字典是這樣解釋的：


yet more/bigger/higher etc
used to emphasize that something is even more than it was before or is in addition to what existed before SYN still:
He got a call from the factory, telling of yet more problems.
Inflation had risen to a yet higher level.
yet another reason to be cautious
The meeting has been cancelled yet again (=one more time after many others).



回到題目中，A選項的yet不是表示already，因此與現在完成式無關，BDE的時態改成現在完成實屬畫蛇添足，此句型沒有明顯的時間副詞提示要用現在完成。何況yet是與否定、疑問中才會表示already。

supershuang