Some photos taken by the children.为什么没有were?定语指句子哪一部分?什么叫过去分词做定语?

some photos taken by the children of Yushu Qinghai 为什么用taken 而不是were taken Some photos by Afican ChildrenSome photos_______ by Afican ChildrenAare taken -Btaken - Cwere taken what's on show?some photos _______ by a chid.A TAKEN B WERE TAKEN C ARE TAKEN what's on show?some photos _______ by a chid.A TAKEN B WERE TAKEN C ARE TAKEN 主动改被动语态Mrs Bush took some photos in Paris改为Some photos were taken by Mrs Bush in Paris等于Some photos were taken in Paris by Mrs Bush -What are on show in the museum?-Some photos _ by the children of Yushu,Qinghai.A.have been taken Some photos taken by the children.为什么没有were?定语指句子哪一部分?什么叫过去分词做定语? What's on show in the museum?Some photos (taken) by the well-know photograher.括号为啥这样填?为啥不能填 are taken What are on show in the museum?Some photos——by the children of Yushu,Qinghai..A.have been taken B.were taken C.are taken D.taken为什么不选a 选择下题答案并对其他选项不能选的原因.--What are on show in the museum?--Some photos ______ by the children of Yushu,Qinghai.A.have been taken B.were taken C.are taken D.taken 不懂,求理由.What are on show in the museum?Some photos ____ by the children of Yushu,Qinghai.A have been taken B were taken C are taken D taken 希望你们可以把ABC错的原因告诉我. there are many photos of children,____were taken by their father.A.all of themB.all of thatC.some of whichD.some of that 英语：What are on show in the museum?-Some photos _ by the children of Yushu,Qinghai.A.have.-What are on show in the museum?-Some photos _ by the children of Yushu,Qinghai.A.have been taken B.were taken C.are taken D.taken 为什么选D,不选C呢 what are on show in the museum?====Some photos【 】by African children.A.are taken.B.were takenwhat are on show in the museum?====Some photos【 】by African children.A.are taken.B.were taken.C.taken They have taken some photos.改为一般疑问句, The photos are mainly taken by the students.对吗? --What are on show in the museum?--Some photos ___ by African children.A.are taken B.were taken C.taken D.have been takenB C D应选哪一个, 我在做英语题时有这样一个句子：Some photos taken by children.请问这里面的taken是表示被动的吗?如果是,那能否直接用被动语态,写成are/were taken?