---Excuse me, could you tell me where the nearest post office is?---The nearest post office? You will have to walk ______.A.500-metres awayB.500 metre farC.500 metres fartherD.500-metre-far away
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C解析考查计量的表示法。在英语中，计量常用“基数词+量词（如metre (s) / kilometer (s) 等）+形容词（如long / wide / high / deep等）”，A、D两个选项中都使用了连字符号，B选项中的metre没有用复数形式，故可以排除，选C。