In later years people reported a monster swimming across the lake.A. to seeB. have seenC

问题补充：

In later years, people reported a monster swimming across the lake.

A. to see

B. have seen

C. seeing

D. to have seen

答案：

A. to see

B. have seen

(答案→)C. seeing

D. to have seen

解析：考察report的用法。该处report意为报告， report doing sth，

句意为后来几年，人们报告说看到一个怪物横游这个湖。