【单选题】【消耗次数：1】
I [填空] it about two days ago.
①
have
②
has
③
had
④
having
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【判断题】
与该名字空间对应的schema文档的URL，这样在当前XML实例文档中凡是被该名字空间作用的元素和属性，XML解析器会到与该名字空间对应的schema文档中去查找这些元素和属性的定义，进行有效性检查。
①
正确
②
错误