问题补充：
If Newton lived today, he would be surprised by what in science and technology.
A. had discovered
B. had been discovered
C. has discovered
D. has been discovered
答案：
A. had discovered
B. had been discovered
C. has discovered
(答案→)D. has been discovered
解析：考查时态。这里If Newton lived today 是一个虚拟条件从句，对后面主句的时间段没影响he would be surprised by what in science and technology 这个句子中，主语是what has discovered in science and technology, 这里的discover是延续到今的，至今为止所发现的科学技术，故选D。
