问题补充：
单选题Shanghai, China’s biggest and the most dynamic city, which______ in the Yangtze River Delta, is playing a leading role in the country’s economyA.is situatedB.situatedC.has situatedD.is situating
答案：
A解析考察被动语态. Situate使位于;使处于.which是situate的逻辑宾语,故用被动语态,选A
