问题
选择题
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
答案
答案：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。