At the railway station, the mother waved goodbye to her daughter until the train was . A.

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(答案→)A. out of sight
B. out of reach
C. out of order
D. out of place
解析：
这题考查词组辨析：out of sight看不见out of reach够不着out of order秩序混乱out of place在不恰当的位置。根据句意：在火车站，妈妈向女儿挥手告别，直到火车消失不见。选A。