问题描述：
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
该选哪个?
A.6000 metres long B.6000-metres-long
C.6000-metre-long D.6000 metre long
该选哪个?
问题解答：
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