A new kind of drug ___ ___ to cure H7N9 bird flu by the scientists and they are
题型:不详难度:来源:
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 |
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答案
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。 |
举一反三
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