During a project’s execution phase, some resource are not available as planned. What should the project manager do? 在一个项目的执行阶段，一些资源不能按照计划可用，项目经理应该怎么做？ ◑A.Escalate the issue to the project sponsor.将该问题上报给项目发起人 ◑B.Submit a change request提交变更请求 ◑C.Implement the risk response plan实施风险应对计划 ◑D.Negotiate with other project managers与其他项目经理进行谈判
