Ten years a long time in one’s life.A. has beenB. areC. isD. have been

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A. has been
B. are
(答案→)C. is
D. have been
解析：考查主谓一致。时间，金钱，距离等做主语时，谓语动词应用单数形式，句意：在人生当中十年是一段很长的时间。根据语境应用一般现在时，故选C。