题目

If Newton lived today, he would be surprise by what ____ in science and technology. A. had discovered                              B. had been discovered C. has discovered                               D. has been discovered 答案：D 解析: 先判断“what”和“discover”之间为被动关系，排除A和C; 再从整个题干时态（lived, would be）判断是虚拟语气，表示与现在相反，故应选D，表示到目前为止所发现的。.

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