【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(shí)態(tài)。句意：到目前為止，造訪過(guò)南極的科學(xué)家不超過(guò)15人。根據(jù)時(shí)間狀語(yǔ)“till now”可知本題應(yīng)該用現(xiàn)在完成時(shí)，故C項(xiàng)正確。

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