—Why haven’t you asked her to come here?

—She _______ an important experiment when I found her and she _____ it.

A．had done ; didn’t finish

B．was doing ; hasn’t finished

C．did ; wouldn’t finish

D．did; hadn’t finished

常用的管理信息系统开发方法有（）

A.周期法

B.系统集成法

C.原型法

D.设计法

E.生命周期法