这句话的回答形式是 the color of the floor used be to do sth……这个颜色的地板过去是做……用的所以当问问题时,把 do 提前,这里是过去式（过去曾经是）,就是第一种问法啦~如果是第二种问法要去掉used to be What...
what did the color of the floor use to be还是What is the color
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