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
With the help of high technology, more and more new substances in the past years.A. disc
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解决时间 2021-04-04 15:35
- 提问者网友：你给我的爱
- 2021-04-03 20:04
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- 五星知识达人网友：野味小生
- 2021-04-03 21:13
A. discoveredB. have discovered C. had been discovered(答案→)D. have been discovered解析：时态和语态。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。
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- 1楼网友：独钓一江月
- 2021-04-03 22:14
我好好复习下
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