题目内容
14、With the help of high technology, more and more new substances in the past years.
A．discovered
B．have discovered
C．had been discovered
D．have been discovered
试题答案
14、 D
解析： 由句中的时间状语in the past years可知，空格应填现在完成时；又因句子中的主语new substances与discover为被动关系，故选D项。
With the help of high technology, more and more new substances____in the past years.
A. discovered B. have discovered C. had been discovered D. have been discovered
查看习题详情和答案>>With the help of high technology, more and more new substances ______ in the past years.
A. discovered B. have discovered
C. had been discovered D. have been discovered
查看习题详情和答案>>With the help of high technology, more and more new substances ______ in the past years.
A. discovered B. have discovered
C. had been discovered D. have been discovered
查看习题详情和答案>>With the help of high technology, more and more new substances in the past years.
A．discovered
B．have discovered
C．had been discovered
D．have been discovered
查看习题详情和答案>>With the help of high technology, more and more new substances ______ in the past years.
A. discovered B. have discovered
C. had been discovered D. have been discovered
查看习题详情和答案>>
With the help of high technology, more and more new substances ______ in the past years.
A. discovered B. have discovered
C. had been discovered D. have been discovered
查看习题详情和答案>>
With the help of high technology, more and more new substances in the past years.
A. discovered B. have discovered C. had been discovered D. have been discovered
查看习题详情和答案>>
With the help of high technology, more and more new substances _______ in the past years.
- A.discovered
- B.have discovered
- C.had been discovered
- D.have been discovered