问题补充:
is clear the Diaoyu islands have been Chinas inherent territory (固有领土)both from historical and legal aspects since ancient times.
A. That; that
B. This; this
C. It; that
D. What; what
答案:
A. That; that
B. This; this
(答案→)C. It; that
D. What; what
解析:考查形式主语句。本题的it是形式主语,真正的主语是that所引导的主语从句,that在句中不充当任何成分,只是一个引导词,没有任何的意思。句意:钓鱼岛自古以来就是中国的领土这一点是非常清楚的。故C正确。