Experiments of this kind in both the U.S and Europe well before the Second World War.
A. had conducted
B. have conducted
C. have been conducted
D. had been conducted
Experiments of this kind in both the U.S and Europe well before the Second World War. A. h
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解决时间 2021-04-12 18:22
- 提问者网友：留有余香
- 2021-04-12 09:33
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- 五星知识达人网友：人间朝暮
- 2021-04-12 10:25
A. had conductedB. have conductedC. have been conducted(答案→)D. had been conducted解析：考查时态。根据句中时间状语before the Second World War可知用过去完成时，且“实验”是被“进行”，故选D。
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- 1楼网友：一袍清酒付
- 2021-04-12 11:58
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