—Andy works hard．

—So he does．He is often seen _____ heavily before his teammates have even arrived at practice．

A．to be sweated

B．sweated

C．be sweated

D．sweating

软件开发的结构化生命周期方法将软件生命周期划分成( )。

A．定义、开发、运行维护

B．设计阶段、编程阶段、测试阶段

C．总体设计、详细设计、编程调试

D．需求分析、功能定义、系统设计