问题
单项选择题
The public transports 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
答案
参考答案：D
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The public transports 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
参考答案：D