【题目】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
在线课程【答案】B
【解析】
试题分析：名词drug与develope之间是被动关系，且根据句子的语境判断是现在进行时，所以选择B项。句意：据信当今被科学家研究的新类型药品将会起到很大的帮助作用，并且在数个月之内成功。