— 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. He was kept waiting
网友回答
A. Having kept waiting
(答案→)B. Being kept waiting
C. To be kept waiting
D. He was kept waiting
解析：本题考查非谓语动词的用法。此处应用动名词短语回答提问，作句子的主语，同时动作又表示被动，故用动名词的被动式。