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
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