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A new kind of drug ___ ___ to cure H7N9 ...

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

 

 B 【解析】 试题分析: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。 考点:考查时态语态
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