— 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．He was kept waiting

肾小球疾病作为一组疾病是（）

A.病理变化相仿

B.病因相仿

C.发病机制类似

D.临床表现类似

E.主要病变在肾小球