问题补充:
At the railway station,he waved goodbye to his friend 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:
句意为:在火车站,他挥手同他的朋友告别直到火车看不见了。out of sight看不见,符合题意。