在英語(yǔ)中it is said/supposed/thought/believed/reported/expected...that...句型經(jīng)?？梢該Q成從句中的主語(yǔ)+is said/supposed/thought/believed/reported/expected/considered...to do的形式,如果that句子的謂語(yǔ)動(dòng)詞已經(jīng)發(fā)生,to do要換成to have done;如果that中的謂語(yǔ)動(dòng)詞正在發(fā)生,to do中的do用be doing;其他的基本用to do 就行.這些結(jié)果基本翻譯為據(jù)說(shuō)/據(jù)報(bào)道/人們相信/人們料想某人.如：據(jù)說(shuō)他昨天離開(kāi)了這家工廠了.It is said that he left the factory yesterday.=He(that句中的主語(yǔ)) is said to have left(that后的動(dòng)作已經(jīng)發(fā)生,所以這里用to have done的形式,) the factory yesterday.
據(jù)報(bào)道他正在美國(guó)讀書(shū).It is reported that he is studying in UAS now.=He is repprted to bestudying in USA now.
人們相信他會(huì)成功的.It is believed that he will make it some day.=He is believed to make it some day.
所以本句話中替換括號(hào)中的句子可以換為It is believed that it was placed.,然后就可以換成it（that句中的主語(yǔ)）is believed to have been placed（that后的謂語(yǔ)動(dòng)作已經(jīng)發(fā)生,所以不定式后用完成式的形式）.故最佳答案為A
能明白嗎?