题目

Jackson __________ school two years ago and he __________ for two years.A. leaves; has gone B. left; has been awayC. leaves; has been away D. left; has gone 答案：【答案】B【解析】句意：Jackson2年前离开了学校，他离开2年了。根据two years ago可知第一句用一般过去时态，排除A/C；根据for two years.可知第二句用现在完成时态，go是短暂性动词，不能和时间段连用，be away 离开，是延续性动词；故选B。10．以下命题正确的是（　　）A．小于90°的角是锐角B．A={α|α=k•180°，k∈Z}，B={β|β=k•90°，k∈Z}，则A⊆BC．-950°12′是第三象限角D．α，β终边相同，则α=β