It is believed that a new kind of drug ______ by the scientists and they are hopeful that they ...

Itisbelievedthatanewkindofdrug______bythescientistsandtheyarehopefulthattheywillsucce... 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 developed B.is being developed C.is developing D.has developed 展开
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秋梵高明35
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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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