. The train for twenty minutes.A. leftB. has leftC. is leavingD. has been away

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A. left
B. has left
C. is leaving
(答案→)D. has been away
解析：此题考查延续性动词和段时间状语搭配。For + 时间段， Leave 离开 为短暂动词，不能和时间段连用， 所以用away, have been away 表示状态的延续。