Question

（2007天津，13）If Newton lived today, he would be surprised by what ________ in science and technology.

1. A.
   had discovered
2. B.
   had been discovered
3. C.
   has discovered
4. D.
   has been discovered

Answer 1

D
句意：如果牛顿还活着，他会惊叹于今天科学技术的新发现。题干中what在从句中作主语，又是动词discover的承受者，所以要用被动语态。据此排除A、C。又据题意中today以及惊叹的是到现在为止的发现，便可推断要用现在完成时的被动语态，故选D。