标题: GWD17-Q38（对比大全一题） 关于时态，战友们帮忙！ [打印本页] 作者: Avatar800 时间: 2010-6-21 00:41 标题: GWD17-Q38（对比大全一题） 关于时态，战友们帮忙！ All Y chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.
A.a single ancestor’s who is thought to have lived
B.a single ancestor’s who was thought to live
C.a single ancestor whom it is thought had lived
D.the Y chromosome of a single ancestor who is thought to have lived
E.the Y chromosome of a single ancestor whom it was thought had lived
请教大全157
157.Balzac drank more than fifty cups of coffee a day and died of caffeine poisoning; furthermore, caffeine did not seem to bother Samuel Johnson, the great writer and lexicographer, who was reported to have drunk twenty-five cups of tea at one sitting. (B) however, caffeine did not seem to bother (C) however, caffeine did not seem to have bothered
绿色标出的为正确答案，这两道题我真无语......................作者: 姿姿不倦 时间: 2010-6-25 16:55
唔.虽然我第一题也是错的.但是我发现第一题的D和第二个题目题干的一句结构好像啊。。 the Y chromosome of a single ancestor who is thought to have lived who was reported to have drunk twenty-five cups of tea at one sitting
看到另一个帖子有TX说: be thought/known to have done是一个好的表达，表明done的事情发生在过去，并不是表示完成。举个例子：
如果用It is known造句：It is known that Edison invented electronic light bulbs in 2000.
如果把这个句子改称be known to的形式就要用: Edison is known to have invented electronic light bulbs in 2000. 地址在http://forum.chasedream.com/GMAT_SC/thread-363418-1-1.html作者: Avatar800 时间: 2010-6-25 17:41
见过此帖，但不认为这种说法合理，况且第二题的题干那句和第一题的D还是又差别的，was和is没有影响么？再求解~作者: 姿姿不倦 时间: 2010-6-25 17:46
who is thought是 现在被认为啊 所以用is was reported是过去被报道过么。 不过我说这两个好像纯粹是觉得凑巧。。小发现。。和这个解题无关啦哈哈。。作者: 红尘道士 时间: 2010-6-25 19:58
http://forum.chasedream.com/GMAT_SC/thread-91380-1-1.html 这个帖子讲的很清楚作者: 红尘道士 时间: 2010-6-25 20:12
根据上面帖子的说法 the Y chromosome of a single ancestor who is thought to have lived 是别人的看法，不是作者的看法 however, caffeine did not seem to bother 是作者自己的看法 who was reported to have drunk twenty-five cups of tea at one sitting