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?

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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
该选哪个?

没问题,肯定是A了.两种形式:6000 meters long或者6000-meter long.

选A