Question

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

Answer 1

D

試題分析：考查句型：sb/sth is said to do/to have done,據(jù)相信某人/某物…，如果是將要做，用不定式一般式to do如果是已經(jīng)做了，用不定式的完成式，句意：據(jù)說(shuō)這條河在過(guò)去的10年里已經(jīng)被污染了，用不定式完成式的被動(dòng)，選D。
點(diǎn)評(píng)：固定句型是學(xué)習(xí)語(yǔ)言的重要環(huán)節(jié)。sb/sth is reported /believed to do/to have done,可以轉(zhuǎn)化成It is reported /believed that句型，解答這類題目，關(guān)鍵是理解題干意思從而判斷是動(dòng)詞不定式的什么形式，根據(jù)意思放入句子中進(jìn)行比較，不難選出正確答案。