(2013·高考湖北卷)An artist who was recently traveling on a ferry to the southern island discovered a long lost antique Greek vase.
A. at random
B. by chance
C. in turn
D. on occasion
网友回答
A. at random
(答案→)B. by chance
C. in turn
D. on occasion
解析：选B。句意：最近，一名画家坐轮渡到南岛，意外发现了一个失踪很久的古希腊花瓶。at random“随意地”；by chance“偶然”；in turn“轮流，依次”；on occasion“有时，间或”。这里表示坐轮渡的时候“偶然”发现了古董，因此选B项。