If Newton lived today,he would be surprise by what ___ in science and techn

题目

If Newton lived today,he would be surprise by what ___ in science and techn
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
选哪个,用什么时态,为什么,

答案

选D,如果牛顿还活着,他会对现如今科学和技术上的发现感到惊讶.what指代的是science and technology,作主语是用单数,并且说的是现如今,所以选has,discover的主语是物是用被动,被发现,所以选D不选C,不懂了还可以问我,希望能帮到你