that为主语,has changed谓语为单数,很容易排除复数先行词的。
In 1990, new rules and guidelines were adopted in the United Kingdom that has changed the whole field of Archaeology in that country.
网友很可能抄错了句子。漏掉了一个关键连词 and!
In 1990, new rules and guidelines were adopted in the United Kingdom and that has changed the whole field of Archaeology in that country.
加上 and 后成为并列句。that 变成指示代词,指代前文整个分句。
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