摘要：18．[2010·全国大联考] is known to all, the earth travels round the sun once every year． A．That B．As C．What D．It 18B本题考查as引导的定语从句.当as引导定语从句.修饰整个主句时.可以放在句首.句中或者句尾.注意:be known to -是一个固定词组.意思是“为 - 所熟知 ,如果本题用D项.则应改为“It is known to all that the earth - .

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