Extreme Programming (XP) is a discipline of software development with _1of simplicity, communication, feedback and courage. Successful software development is a teameffort - not just the development team, but the larger team consisting of customer,management and developers. XP is a simple process that brings these people together andhelps them to succeed together. XP is aimed primarily at object-oriented projects using teamsof a dozen or fewer programmers in one location. The principles of XP apply to any 2_project that needs to deliver quality software rapidly and flexibly. An XP project needs a(an) 3_customer to provide guidance. Customers, programmers, managers, are all working _4to build the system that'sneedeD． Customers - those who have software that needs to be developed - will learn simple,effective ways to_5what they need, to be sure that they are getting what they need,and to steer the project to success.
3、_____

A

part-time

B

casual

C

seldom

D

full-time

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答案：

D

根据题目描述，XP项目需要一个客户来提供指导，考虑到XP强调团队成员之间的紧密合作和共同成功，客户需要全职参与以提供持续的指导和反馈。因此，选项D“full-time”是正确答案。