是否应该用不定式完成式的问题

friday

这是三个是否应该用不定式完成式的问题。 我总是分不清什么时候用不定式现在式or, 不定式完成式: 请指点！

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)  ( the right answer is D)
(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

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.(C ) (the right answe is B)
(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

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.(D) ( the right answer is A)
(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

gemj

请高手指点，我也晕这个。

jq_jou

不定式的完成时是用于强调不定式的动作发生在主要动作之前. 如果不为了强调, 通常只用一般现在式