A new kind of drug to cure H7N9 bird flu by the scientists and they are hopeful that they will succeed in a couple of weeks.
A. has been developed
B. is being developed
C. is developing
D. has developed
A new kind of drug to cure H7N9 bird flu by the scientists and they are hopeful that the
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解决时间 2021-03-30 05:58
- 提问者网友：wodetian
- 2021-03-30 02:23
最佳答案
- 五星知识达人网友：三千妖杀
- 2020-12-09 01:42
A. has been developed(答案→)B. is being developedC. is developingD. has developed解析：句意：一种新的药物正在被科学家开发来治疗H7N9禽流感，他们希望他们会在几个星期后成功。从they are hopeful that they will succeed in a couple of weeks. 可知是正在开发，而且drug和develop是被被动关系，选B。
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- 1楼网友：雾月
- 2021-02-19 14:28
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