题目选项分析

Calling for a ceasefire in South Sudan, where unrest has killed more than a thousand people, China has offered to step forth as the African state's biggest oil investor and

acting as a peace broker, directly engaging

Calling for a ceasefire in South Sudan, where unrest has killed more than a thousand people, China has offered to step forth as the African state's biggest oil investor and

act as a peace broker, directly engaging