Shanghai China’s biggest and the most dynamic city which in the Yangtze River Delta is

问题补充：

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

答案：

(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.