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

At the railway station，the mother waved goodbye to her daughter until the train was .
A. out of sight
B. out of reach
C. out of order　
D. out of place

(答案→)A. out of sightB. out of reachC. out of order　D. out of place解析：考查介词短语。A看不见；B够不着；C杂乱；D不在合适的位置；结合句意可知A正确。句意：在火车站，那位妈妈一直和女儿挥手告别直到火车看不见了。

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