. By the year 2020 scientists a lot of research on AIDS.A. had doneB. doC. are doingD. wi
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解决时间 2021-04-03 18:52
- 提问者网友：愿为果
- 2021-04-03 06:42
. By the year 2020 scientists a lot of research on AIDS.
A. had done
B. do
C. are doing
D. will have done
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- 五星知识达人网友：往事隔山水
- 2021-04-03 08:03
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：傲气稳了全场
- 2021-04-03 09:23
我也是这个答案
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