____ well known to the Irish is ____ St. Patrick was taken to Ireland as a prisoner when he was 16.A.It, thatB.As, what C.That, whatD.What, that
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A解析试题分析：原句意思是，爱尔兰人都知道，帕特里克在他十六岁时，作为囚犯，被带到了爱尔兰。it 是形式主语，后边that引导的从句是句子的真正主语，所以选A。考点：本题重点考查it 的用法及从句。
点评：本题的句型结构不太常见，适当调整一下就很容易理解了：It is well known to the Irish that St. Patrick was taken to Ireland as a prisoner when he was 16.。