请教三道XDF题！

12. Traveling the back roads of Hungary, in 1905 Béla Bartók and Zoltán Kodály began their pioneering work in ethnomusicology, and they were armed only with an Edison phonograph and insatiable curiosity.

(B) In 1905, Bela Bartok and Zoltan Kodaly, traveling the back roads of Hungary, began their pioneering work in ethnomusicology, and they were only armed

(C) In 1905 Bela Bartok and Zoltan Kodaly began their pioneering work in ethnomusicology, traveling the back roads of Hungary armed only

答案 C, 我选B

      难道现在分词能和过去分词并列，可以一起做状语，不用and 连接吗？

19. The commission acknowledged that no amount of money or staff members can ensure the safety of people who live in the vicinity of a nuclear plant, but it approved the installation because it believed that all reasonable precautions had been taken.

(A) no amount of money or staff members

(B) neither vast amounts of money nor staff members

(C) neither vast amounts of money nor numbers of staff members

(D) neither vast amounts of money nor a large staff

(E) no matter how large the staff or how vast the amount of money

答案D, 为什么C不好？

24. Even though its per capita food supply hardly increased during two decades, stringent rationing and planned distribution have allowed the People’s Republic of China to ensure nutritional levels of 2,000 calories per person per day for its population.

(A) Even though its per capita food supply hardly increased during

(B) Even though its per capita food supply has hardly increased in

(C) Despite its per capita food supply hardly increasing over

      (D) Despite there being hardly any increase in its per capita food supply

(E) Although there is hardly any increase in per capita food supply for

答案E   选项B为什么不好？其中的it 指代主句中的宾语，难道不行吗？