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    精英家教网 > 高中英语 > 题目详情
    It is believed that a new kind of drug ______ by the scientists and they are hopeful that they will succeed in a few months.
    A．has been developedB．is being developed
    C．is developingD．has developed
    B
    考查时态和语态。主语drug和动词develop是动宾关系，所以要用被动语态，排除C,D；根据they will succeed in a few months，可知还没有开发出来，所以不能用现在完成时态，选B，正在被开发。
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