请教GWD17-14,答案给的B,讨论贴说A?

看了讨论贴，大多数说A,可答案为什么给的是B呀？

我觉得“competing companies one day may be partners the next”是有逻辑错误，是partner就不再是competing 了，应该是 “companies that compete one day may be partners the next”，意思是曾经时competing,现在是partner.

请NN指点！

14. GWD17-Q14:

Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete one day may be partners the next.

1. Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete
2. Although the lines of competition are clearly defined in industries that are more established, they are blurred and indistinct in the Internet industry, as competing companies
3. The lines of competition are clearly defined in the more established industries, unlike the Internet where they are blurred and indistinct, as companies that compete
4. Unlike more established industries, where the lines of competition are clearly defined, they are burred and indistinct in the Internet industry, as companies that compete
5. Unlike more established industries, with clearly defined lines of competition, those of the Internet industry are blurred and indistinct, as competing companies

   Answer:

A is incorrect.

1 Whereas seldom appears in the beginning of a sentense.

2 "they" in A indicates what? Confusing.

But both A and B have 'They', why 'they' in B is correct but 'they' in A is wrong?

我觉得是b划线部分最后有问题，这里的意思是一天是竞争公司，第二天就成为合作伙伴。如果用 competing companies one day may be partners the next，有的不通