问题
选择题
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
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。