It is believed that a new kind of drug ______ by the scientists and they are hopeful that they
will succeed in a couple of months.     
[     ]
A. has been developed  
B. is being developed  
C. is developing  
D. has developed
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將以下句子改成被動語態(tài)。
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把下列句子變?yōu)楸粍诱Z態(tài)。
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