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    16．At the railway station，the mother waved goodbye to her daughter until the train was ______．（　　）
    A．out of sightB．out of reachC．out of orderD．out of place

    分析 在火车站，母亲挥手告别她的女儿直到火车看不见了．

    解答 答案：A，考查介词短语的辨析，A是看不见的意思，B是够不着的意思，C是出故障的意思，D是不合适，不恰当的意思，根据语境是"直到火车看不见了"，故答案为A．

    点评 考查介词短语的辨析，在平时的学习中要对这些短语进行积累，再根据具体的语境确定答案．

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