Shanghai, China’s biggest and the most dynamic city, which in the Yangtze River Delta, is playing a leading role in the country’s economy.
A. is situated
B. situated
C. has situated
D. is situating
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(答案→)A. is situated
B. situated
C. has situated
D. is situating
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.