The big fire in Shanghai, believed to ______ due to the burning of construction materials, caused 58 deaths and destroyed all the belongings of the people there.
A.have occurredB.occur
C.have been occurringD.be occurring
A

試題分析:考查固定句型:Sth is believed to do/to have done…據(jù)說將要做/已經(jīng)做了,句意:上海最大的火災(zāi)據(jù)說是由于焚燒建筑材料造成的,導(dǎo)致58人死亡,毀了那里人們所有的財物。意思應(yīng)該使用主動態(tài)而且是完成時態(tài)的不定式。occur是已經(jīng)發(fā)生的動作,用不定式的完成時態(tài);該詞的用法只可能用主動語態(tài)。因而答案是have occurred!選A。
點評:這個句型可以變成:It is believed that…,還要注意用不定式的一般式還是完成,另外 occur是不及物動詞,沒有被動態(tài),在這里,表示動作已經(jīng)完成,所以要用完成時。表示發(fā)生的幾個詞,occur,happen,take place,全作不及物用,沒有被動態(tài)。
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