4.The river through our city,which is about _________,is clean again.A.6000 metres long B.6000-metres-long C.6000-metre-long D.6000 metre long为什么?

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4.The river through our city,which is about _________,is clean again.
A.6000 metres long B.6000-metres-long
C.6000-metre-long D.6000 metre long
为什么?

A.6000 metres long

选A

a是对滴。