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
Dhad been conducted
Experiments of this kind in both the US and Europe well before the Second World War．A. ha
答案:2 悬赏:20 手机版
解决时间 2021-01-03 14:42
- 提问者网友：我是女神我骄傲
- 2021-01-02 20:14
最佳答案
- 五星知识达人网友：煞尾
- 2021-01-02 20:53
A. had conductedB. have conductedC. have been conducted(答案→)D. had been conducted解析：试题分析: 考查动词时态。根据before the Second World War可知此处是指过去的过去，应该用过去完成时；而experiment和conduct是被动关系，所以用过去完成时的被动形式,故答案选D。句意：二战前就在美国和欧洲进行过这种实验。
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- 1楼网友：有你哪都是故乡
- 2021-01-02 22:04
这个答案应该是对的
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