当（ ）时，用例是捕获系统需求最好的选择。
- A.系统具有很少的用户
- B.系统具有很少的接口
- C.系统算法复杂，功能单一
- D.系统有很多参与者
正确答案及解析
正确答案
解析
用例描述的是系统的用户跟系统的交互，是开发者与用户交流的工具，可用来很好的定义系统的边界。所以当用户较多时，可以用用例较好的捕获系统的需求。
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