(2013·湖北，30)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：考查短语辨析。此处表示“偶然发现了一个遗失多年的古希腊花瓶”，故选B。