The graduation ceremony, which thousands of graduates _________ last night, was a success.

A．appointed

B．absorbed

C．attended

D．attracted

铁路工程质量管理中为便于管理经常划分成几个阶段，正确划分的质量管理阶段有()。

A.施工准备阶段 

B.施工生产阶段 

C.竣工验收阶段 

D.回访与保修阶段 

E.工程建设阶段