问题
选择题
At the railway station, the mother waved goodbye to her daughter until the train was _______.
A．out f sight
B．out f reach
C．out of order
D．out of place
答案
答案：A
本题考查介词短语辨析。out of sight看不见，在视野之外；out of reach够不着，达不到；out of order运转不正常，出毛病; out of place不在适当的位置, 不恰当。从句意可以看出，应选A。