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        1. 【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(dòng)詞。句意:這個(gè)科學(xué)家在做了大約600個(gè)臨床試驗(yàn)后,找到了這個(gè)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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