【題目】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】

考查非謂語動詞。句意：這個科學(xué)家在做了大約600個臨床試驗后，找到了這個疾病的治療方案。根據(jù)邏輯順序，應(yīng)當(dāng)是先做了臨床試驗，才能確定治療方案，所以用having studied作狀語。故選C。

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