[求助]GWD15的两道语法题,大家帮忙啊!!

Q12:

For the farmer who takes care to keep them cool, providing them with high-energy feed, and milking them regularly, Holstein cows are producing an average of 2,275 gallons of milk each per year.

1. providing them with high-energy feed, and milking them regularly, Holstein cows are producing
2. providing them with high-energy feed, and milked regularly, the Holstein cow produces
3. provided with high-energy feed, and milking them regularly, Holstein cows are producing
4. provided with high-energy feed, and milked regularly, the Holstein cow produces
5. provided with high-energy feed, and milked regularly, Holstein cows will produce

   Answer: E

-----------------------------------------------------------------------------------------------这里E的will produce实在让我不解...因为考虑应该用一般时态和单复数同行, 我做题使就选择了A.

可是答案给的是E.大侠们谢谢解释下啊~~~~~

1. the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries
2. the shuttle and earlier spacecraft, with sufficient enough power in fuel cells and batteries for their short flights
3. the short flights of the shuttle and earlier spacecraft, which enabled them to carry sufficient enough power in fuel cells and batteries
4. the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells and batteries for their short flights
5. the flights of the shuttle and earlier spacecraft, whose shortness allowed them to carry sufficient power in fuel cells and batteries

   Answer: D

----------------------------------------------------------------------------------------------我的疑问是: B这个选项有什么问题呢？为什么D比B好？

12题我的理解是这个句子翻译成中文是『只要…………就…………』

只要farmer这样这样，cows就年产多少多少

所以用将来时