问题补充:
The DiaoYu Island have been part of China’s territory since ancient times, as important fishing grounds of Taiwan.
A. served
B. serving
C. to serve
D. having served
答案:
A. served
(答案→)B. serving
C. to serve
D. having served
解析:考察分词做状语。本句中的主语the DiaoYu Island和后面的动词serve as构成主动关系,故使用现在分词在句中作状语。句意:钓鱼岛自古以来就是中国的一部分,作为台湾的一个重要的渔场。故B正确。