问题补充：
What will people die of in 100 years? If you think that is a simple question, you attention to the revolution taking place in biotechnology．
A. have not been paying
B. had not been paying
C. were not paying
D. will not be paying
答案：
(答案→)A. have not been paying
B. had not been paying
C. were not paying
D. will not be paying
解析：考查时态，由前面的句子可以确定现在时，句子意思“你一直没有注意发生在生物技术的革命”，由句子意思可以知道，一直没注意，所以用现在完成进行时态，所以选A
