--- What made Bill so angry?
--- . His girl friend promised to e at 8:30, but she hasn’t e yet.
A. Having kept waiting
B. Being kept waiting
C. To be kept waiting
D. Being kept waited
网友回答
A. Having kept waiting
(答案→)B. Being kept waiting
C. To be kept waiting
D. Being kept waited
解析：题干是什么使Bill 如此的生气？应回答为Being kept waiting made Bill so angry . 一直等使Bill很生气。选B ,这是一种省略结构。