If Albert Einstein lived today, he would be surprised by what________ in science and technology.

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问题 If Albert Einstein lived today, he would be surprised by what________ in science and technology.

选项 A、had discovered
B、had been discovered
C、has discovered
D、has been discovered

答案D

解析 本题考查语态。分析句子可知,本句的主从句均为过去时态,即if引导的虚拟条件句表示与现在的事实相反的假设。时间状语today表明what。引导的宾语从句表示的是至今为止所发现的科学技术,这是事实而非虚拟,故宾语从句的谓语动词应该使用现在完成时,表示动作延续至今。由于从句主语是what,表示物,故谓语动词应用被动语态,答案为D项。
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