—Has he changed his mind?

—Yes. After some hours of discussion, I ____ to talk him into accepting the new plan.

A．had managed

B．would managed

C．have managed

D．managed

（）是指对所有造成人类生命财产损失或资源破坏的自然现象的总称，它发生在生态系统的自然过程之中，可以导致社会经济系统失衡，使社会财产遭受损失，导致社会资源出现严重的供需不平衡。