问题
选择题
____ well known to the Irish is ____ St. Patrick was taken to Ireland as a prisoner when he was 16.
A．It, that
B．As, what
C．That, what
D．What, that
答案
A
题目分析：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。
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.。