题目内容：
Increasing resources on the critical path activities may not always shorten the length of the project because:（ ）A．No activities are time-dependent or resource-dependent
B．Activities are always scheduled with optimal number of resources
C．The Project Manager always selects original resources with the highest skill levels
D．Adding more resources may create additional work and produce inefficiencies A．没有活动是依赖时间或依赖资源的
B．总是以最佳的资源数量来安排活动
C．项目经理总选择具有最高技能水平的初始资源
D．增加更多的资源可能产生额外的工作并且导致效率低
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答案解析：