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    【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(yàn)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(yàn),才能確定治療方案,所以用having studied作狀語。故選C。

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