—excuse me.Is there a post office near here —There is one200 metres——this streetA down B over C under D to

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—excuse me.Is there a post office near here —There is one200 metres——this streetA down B over C under D to
—excuse me.Is there a post office near here —There is one200 metres——this street
A down B over C under D to

—excuse me.Is there a post office near here —There is one200 metres——this streetA down B over C under D to
应该选择A,表示一直沿着直走,200米

A down在这里是介词，表示沿...而下
又如:Walk directly down the road and you'll get to the square.
沿这条路一直走,你能到广场。