The river is said in a fire during the past 10 years.
A. to have polluted
B. it has been polluted
C. to pollute
D. to have been polluted
网友回答
A. to have polluted
B. it has been polluted
C. to pollute
(答案→)D. to have been polluted
解析：考查句型：sb/sth is said to do/to have done,据相信某人/某物…，如果是将要做，用不定式一般式to do如果是已经做了，用不定式的完成式，句意：据说这条河在过去的10年里已经被污染了，用不定式完成式的被动，选D。