新概念3第6课,课后习题第4题,请求详解,

新概念3第6课,课后习题第4题,请求详解,
4.The expensive shops in () were just opening .
A.Piccadilly's famous arcade B.a Piccadilly famous arcade C.a famous Piccadilly arcade D.the famous arcade off Piccadilly
那个拱廊街道不是在Piccadilly的旁边么?为什么说是答案说是在Piccadilly上?
2.A和C有什么区别?如果A加上冠词和C有什么区别?
3.如果D把the改为a,那么D正确否?
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