The bridge was built in memory of the adventurer who was believed ______ the valley.
A.to have been discoveredB.to discover
C.to have discoveredD.having been discovered
C

試題分析:考察不定式用法。固定句式sb be believed to do sth某人被認(rèn)為做某事。如果后面表示的事情是已經(jīng)發(fā)生的,那么應(yīng)該使用不定式的完成式to have done來(lái)表示。句意:這座橋梁被建設(shè)是為了紀(jì)念那位探險(xiǎn)家,這個(gè)探險(xiǎn)家被認(rèn)為發(fā)現(xiàn)了這個(gè)峽谷。根據(jù)句意可知這位探險(xiǎn)家發(fā)現(xiàn)這個(gè)峽谷是已經(jīng)發(fā)生的事情,故使用不定式的完成式來(lái)表示。故C正確。
點(diǎn)評(píng):不定式的一般式說(shuō)明不定式的動(dòng)作和謂語(yǔ)動(dòng)詞的動(dòng)作幾乎同時(shí)發(fā)生或者稍后發(fā)生,不定式的進(jìn)行式說(shuō)明這兩個(gè)動(dòng)作同時(shí)發(fā)生;不定式的完成式說(shuō)明這一動(dòng)作發(fā)生在謂語(yǔ)動(dòng)作之前。在解題時(shí)要注意時(shí)間的先后關(guān)系。
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