19.The public transport system in many cities in the world_______by the local authority.A.is still ranB.are still runC.are still ranD.is still run

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19.The public transport system in many cities in the world_______by the local authority.A.is still ranB.are still runC.are still ranD.is still run
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19.The public transport system in many cities in the world_______by the local authority.A.is still ranB.are still runC.are still ranD.is still run
19.The public transport system in many cities in the world_______by the local authority.
A.is still ran
B.are still run
C.are still ran
D.is still run

19.The public transport system in many cities in the world_______by the local authority.A.is still ranB.are still runC.are still ranD.is still run
d

选D 》system 是名词单数所以用is 。由by 可知用被动语态,所以用run 的过去分词也是它本身! 希望我的回答能帮到你!

很急啊 在线等最好9:30以前谢谢了 亲们 新加坡的公共交通系统是世界上最好的其中一个,所以你应该没有任何问题。