So difficult _______ that no one could ______ a good solution to it. [ ]

A. was the problem; come up with    

B. the problem was; come up with

C. the problem was; put up with      

D. was the problem; put up with

某模拟网站的主页地址是http://localhost/djks/index.htm．打开此主页，浏览“天文小知识”页面，查找“海王星”的页面内容，并将它以文本文件的格式保存到考生目录下，命名为“halwxing.txt”。