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

A.visitedB.had visitedC.have visitedD.visit

【答案】C

【解析】

考查時態(tài)。句意：到目前為止，造訪過南極的科學家不超過15人。根據時間狀語“till now”可知本題應該用現(xiàn)在完成時，故C項正確。

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