_____ was established in 1952 which set the stage for more ambitious integration efforts.
A、the European Economic Community
B、The European Parliament
C、The European Union
D、The European Coal and Steel Community
【正确答案】：D
【题目解析】：The European Coal and Steel Community (ECSC) was established in 1952 which set the stage for more ambitious integration efforts.参见教材P37。