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 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】

 D

解析:根據時間狀語today可判斷出要現在完成時,表示已經完成的動作或存在的狀態(tài)。再根據what與discover的關系可確定用被動語態(tài)。If Newton lived today是虛擬語氣,意為“如果牛頓活到今天”。在科技方面的發(fā)現指的是現在的發(fā)現。過去完成時表示一個動作或狀態(tài)在過去某一時間或動作之前已經完成或結束,也可能是早已完成或結束,即“過去的過去”。

 

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