问题补充：
单选题_______iswellknownis________theDiaoyuIslandshavebeenpartofChinasinceancienttimes.A.Which; thatB.That; whichC.What; thatD.That; what
答案：
C解析考察名词性从句。第一空What引导主语从句what is well known且在句中作主语。第二空that引导表语从句that the Diaoyu Islands have been part of China since ancient times.此句子结构很完整，只需要使用that引导，that在句中不充当任何成分，只起引导作用。句意：众所周知的事情是钓鱼岛自古以来就是中国的一部分。故C正确。
