What made Bill so angry?. His girl friend promised to come at 8:30 but she hasn’t

问题补充：

--- What made Bill so angry?

--- . His girl friend promised to come at 8:30, but she hasn’t come yet.

A. Having kept waiting

B. Being kept waiting

C. To be kept waiting

D. Being kept waited

答案：

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。