I saw a lighthouse at the mouth of the river.A. locatingB. locationC. locatedD. which loc

问题补充：

I saw a lighthouse at the mouth of the river.

A. locating

B. location

C. located

D. which located

答案：

A. locating

B. location

(答案→)C. located

D. which located

解析：考查分词做宾语补足语，句意：我看见一个灯塔在河口处。Be located at/in…位于…,see +宾语+宾语补足语，a lighthouse和locate是被动关系，用过去分词做宾语补足语。选C。