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    精英家教网 > 高中英语 > 题目详情
    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 developedB．is being developedC．is developingD．has developed
    B

    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。
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