Founded in 1983,the magazine has since more than doubled its circulation and its advertising.这句话中的since是什么意思?还有就是觉得这句话很奇怪,

The PRC was founded in 1949.变主动语态.快. In 1636,Harvard（哈佛大学）is one of the most famous universities in the United States.A.Being founded B.It was founded C.Founded D.Founding great changes ---in china since the people's republic of china ---in 1949A.have taken place;was founded B.has taken place ;was founded C.have been taken place;founded D.took place;founded founded in 1990还是being founded in 1990 为啥 chicago,founded in 1800,is in many ways the nation's last great city怎么翻译? be founded in 有什么特殊含义吗?整句句子是：it is clear that the two choices are well founded in their respective way. Founded in 1983,the magazine has since more than doubled its circulation and its advertising.这句话中的since是什么意思?还有就是觉得这句话很奇怪, _____in 1636,Harvard is one of the most famous universities in the United States.A Being founded B It was founded C Founded D founding 能不能解释一下为什么选C,不能选其它的 the PRC was founded in 1949这句话是被动语态吗?是过去式时态吗? 英语翻译which was founded in 1877,is one of the oldest higher institutions.这两句话 英语选择题（被动语态）As in other countries.the cities of China were usually ( )where they ( ).A.found needB.founded were neededC.founded neededD.found needed 28.The United Nations ______ in 1945.A.are found B.is found C.was founded D.were founded为什么不选D呢? 28.The United Nations ______ in 1945.A.are found B.is found C.was founded D.were founded我想知道为什么不选D The times ,() in 1785,is popular with important people such as politicians ,lawyers and businessmen ,A.founding B.founded C.foundD.was founded Harvard,________ in 1963,is one of the most famous universities in the United StatesA.setB.formedC.discoveredD.founded The company was found in 1997 The company was founded in 1997 哪个对个人觉得是第二个 翻译这段文字,急.In 1368,Zhu Yuanzhang founded the Ming Dynasty (1368-1644) in Nanjing,and reig 英语选择题求解释为什么选a66.The University of California,_____ in 1868,is administrated by president and governed by a twenty-four-member board of regents.A.founded B.has been founded C.to have been founded D.was founded