885 section B 14,19 与section E 4 的区别

lvzhu

这3道题中前2道没有用动词不定式的完成时，而最后一道用了完成时，我觉得 前2题的动词不定式后面的动词也是发生在前面所指的动词的前面，也是可以用完成时态的。
14.    The Western world’s love affair with chocolate is well-documented: few people have been known to have tasted it for the first time without requesting more.
(A) few people have been known to have tasted it
(B) few having been known to taste it
(C) it has been tasted by few people
(D) few people have been known to taste it
(E) few people having tasted it

答案D 为什么不是A
19.    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.
(A) furthermore, caffeine did not seem to bother
(B) however, caffeine did not seem to bother
(C) however, caffeine did not seem to have bothered
(D) furthermore, caffeine did not seem to have bothered
(E) in addition, caffeine did not seem to bother

答案 B，why not c
4.    In June, 1981, six teenagers in the village of Medjugorje, Yugoslavia, claimed to have had visions of the Virgin Mary, who they say has continued to appear to them over the ensuing years.
(A) claimed to have had visions of the Virgin Mary, who
(B) claimed to have visions of the Virgin Mary, whom
(C) claimed to have had visions of the Virgin Mary, whom
(D) claimed to have visions of the Virgin Mary, who
(E) had claimed to have had visions of the Virgin Mary, whom
正确答案：A

shellyaaa

好问题！我觉得很难回答。最多从句意上。翻译成中文，你看哪个好？？

我们已经知道很少人尝了巧克力后不再要的/我们已经知道很少人已经尝了巧克力后不再要的

咖啡因好像没有影响到S.J / 咖啡因好像没有已经影响到S.J

孩子们说他们已经见到了圣母玛利亚，而且继续出现在后来几年/ 孩子们说他们见到了圣母玛利亚，而且继续出现在后来几年

ericlijg

I am also keen to know the explanation on these issues.  Why not use "to have done"?  I have remembered that the traditional grammar rules are: 

完成时：表示的动作发生在谓语动词表示的动作之前。
　I'm sorry to have given you so much trouble.
　He seems to have caught a cold.

amysarmy

?