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
考查時態(tài)和語態(tài)。主語drug和動詞develop是動賓關系，所以要用被動語態(tài)，排除C,D；根據(jù)they will succeed in a few months，可知還沒有開發(fā)出來，所以不能用現(xiàn)在完成時態(tài)，選B，正在被開發(fā)。
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