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

问题补充：

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：

(答案→)A. out of sight

B. out of reach

C. out of order

D. out of place

解析：介词短语辨析。A视野之外；B够不着；C杂乱；D不得其所的，不适当的；结合句意可知A正确。句意：在火车站，那位妈妈向女儿挥手告别直到火车消失在视野中。