By the year 2020 scientists a lot of research on AIDS.A. had doneB. doC. are doingD. will
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解决时间 2021-04-10 10:44
- 提问者网友：缘字诀
- 2021-04-09 11:53
By the year 2020 scientists a lot of research on AIDS.
A. had done
B. do
C. are doing
D. will have done
最佳答案
- 五星知识达人网友：迟山
- 2021-04-09 12:20
A. had doneB. doC. are doing(答案→)D. will have done解析：可联系答.案.网客服索取。
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- 1楼网友：封刀令
- 2021-04-09 13:32
回答的不错
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