问题
单项选择题
On some projects, especially ones of smaller scope, activity sequencing, activity resource estimating, activity duration estimating, and（）are so tightly linked that they are viewed as a single process that can be performed by a person over a relatively short period of time.
A．time estimating
B．cost estimating
C．project planning
D．schedule development
答案
参考答案：D
解析：
参考译文：在某些项目，特别是在范围较小的项目中，活动排序、活动资源估算、活动历时估算和进度制定连接得如此紧密，以至于它们被视为可以由一个人在相对较短的时间内执行的单独过程。