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

A.studyingB.to studyC.having studiedD.to have studied

【答案】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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