Experiments of this kind in both the U.S. and Europe well before the Second World War started.
A. have conducted
B. have been conducted
C. had conducted
D. had been conducted
Experiments of this kind in both the U.S. and Europe well before the Second World War sta
答案:2 悬赏:40 手机版
解决时间 2021-12-30 10:47
- 提问者网友：献世佛
- 2021-12-29 18:26
最佳答案
- 五星知识达人网友：鸠书
- 2021-12-29 20:03
A. have conductedB. have been conductedC. had conducted(答案→)D. had been conducted解析：句意：在第二次世界大战之前这种实验就在美国和欧洲做过。因为时间状语before the Second World War started.这里的谓语动词是过去式，conduct是在这个动作之前的发生的动作，故用过去完成时，又因为experiments与conduct之间是被动关系，故选D。
全部回答
- 1楼网友：你可爱的野爹
- 2021-12-29 20:38
正好我需要
我要举报
如以上回答内容为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！
点此我要举报以上问答信息
大家都在看
推荐资讯