题目内容：

There are no easy answers to questions brought to us by the rapidly changing world, _______ we can try to turn challenges into opportunities.
A. soB. but C. for D. then详细解答!

优质解答

B. but
前后半句带有明显的转折语境.
翻译如下：
飞速发展的世界给我们打来的（困难）挑战没有简单的解决办法,但是我们可以化挑战为机遇.