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The scientist found a cure for the disea...

The scientist found a cure for the disease, ____ approximately 600 clinical cases.

A.studying B.to study C.having studied D.to have studied

 

C 【解析】 考查非谓语动词。句意:这个科学家在做了大约600个临床试验后,找到了这个疾病的治疗方案。根据逻辑顺序,应当是先做了临床试验,才能确定治疗方案,所以用having studied作状语。故选C。  
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