尽管中国发展很快，但要赶上其他发达国家还有很长的路要走（汉译英）

Though China developed rapidly,she had a long
way to go to catch up with other developed countries.

应该用though

Fast as chinese development is,there is still a long way to go to catch/keep up with the developed countries.
Rapid as china's development is, there is still a long way to go to get abreast of the developed countries.