— I hear John refused to tell the truth and was taken away by the police. 

— Where did you _____? [ ]

A. pick that up

B. put that up

C. make that up

D. take that up

原型化生命周期由10个步骤组成。但这些步骤中（）是其中的基本步骤，也是每个软件原型化工作中必须要经历的步骤。

A、原型系统的积累

B、开发工作模型、模型验证

C、修正和改进

C、整理原型和提供文档