There are solid reasons for China to claim ownership of the Diaoyu Islands which lie abou

问题补充：

There are solid reasons for China to claim ownership of the Diaoyu Islands, which lie about 200 miles the eastern coast of our country.

A. to

B. on

C. off

D. of

答案：

A. to

B. on

(答案→)C. off

D. of

解析：句意：中国完全有理由宣布对离我国东海岸200英里的钓鱼岛拥有主权。表示方位的介词，to表示“在范围以外”，on表示“接壤，在海岸上”，off表示“在沿岸（在水域中）”，of表示“从属关系”，选C.