２５０－10. The fear of rabies is well founded: few people are known to recover from the disease after the appearance of the clinical symptoms.
(A) few people are known to recover from the disease after the appearance of the clinical symptoms
(B) few people are known to have recovered from the disease once the clinical symptoms have appeared
(C) there are few known people who have recovered from the disease once the clinical symptoms have appeared
(D) after the clinical symptoms appear, there are few known people who have recovered from the disease（B）
(E) recovery from the disease is known for only a few people after the clinical symptoms appear
B-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（D）
(E) few people having tasted it
B-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（B）
(E) in addition, caffeine did not seem to bother
to have done感觉很不好把握啊。１０题干嘛用have done？而１８ １９为什么不用？非常晕．．谢谢
我记得以前看过这个问题的讨论，
但是好象其中总结的引用他人的就用完成时也不一定，下面这个就相反：
6. The Quechuans believed that all things participated in both the material level and the mystical level of reality, and many individual Quechuans claimed to have contact with it directly with an ichana (dream) experience.
(A) contact with it directly with
(B) direct contact with it by way of
(C) contact with the latter directly through
(D) direct contact with the latter by means of（D）
(E) contact directly with the mystical level due to
如果有什么结论的话，大家一起讨论吧！
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