单选题 The fact is ______, after years of experimenting, the music industry still hasn't found a way of making significant money out of the Internet.
A. when B. that C. because D. however

【正确答案】 B
【答案解析】[考点] 从句引导词
[解析] 事实是，经过多年实验之后，音乐产业仍然没找到一条通过因特网赚大钱的方式。本句是表语从句，引导词用that，所以选B。