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    【题目】No more than 15 scientists __________ the South Pole till now.

    A.visitedB.had visitedC.have visitedD.visit

    【答案】C

    【解析】

    考查时态。句意：到目前为止，造访过南极的科学家不超过15人。根据时间状语“till now”可知本题应该用现在完成时，故C项正确。

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