All of sudden some passengers on board let out screams, running upstairs like crazy.
A. a;/
B. the;the
C. a;the
D. the;/
网友回答
(答案→)A. a;/
B. the;the
C. a;the
D. the;/
解析：句意：突然，一些在船上的乘客发出尖叫，发疯地向楼上跑。第一空填a，all of a sudden突然，第二空不填，on board是固定短语“在车上，船上，飞机上”，所以选A。