求助几道题,谢谢!

2.     Modern critics are amused by early scholars’ categorizing Tacitus’s Germania as an ethnographic treatise.

(A) scholars’ categorizing Tacitus’s Germania as

(B) scholars’ categorizing Tacitus’s Germania as if

(C) scholars, categorizing of Tacitus’s Germania as

(D) scholars who categorize Tacitus’s Germania as（A）

        (E) scholars who categorize Tacitus’s Germania if

答案是A. 我选D，是不是因为who 之前没有用逗号所以不对？意思上好像也有些不太一样是吗？

9.     Art museums do not usually think of their collections as capital or consider the interest income that would be generated if a portion of the capital would have been invested in another form.

(A) be generated if a portion of the capital would have been

(B) have been generated if a portion of the capital would have been

(C) be generated if a portion of the capital were

(D) be generated if a portion of the capital was（C）

        (E) be generated if a portion of the capital had been

答案是c. 我选了d。 capital 是不可数名词，即使是a portion of 也应该是单数吧？难道是虚拟与其要求不管单数还是复数都要用were (与现在事实相反的时候)？

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

答案是b, 我选了c, 不太搞得清楚了，bother 这个动词不管发生过没有，都应该是过去的了，那么不是应该用have bothered 来表示这个时态吗？