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为什么？
• 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?
• 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这个我一直不是很明白 有连字符和没有连字符的名词作定语的题 能解释具体一点么?说说错的错在哪了?正确的该怎么用?尤其是a和c的区别~
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• There are two bridges _____ the river.(选填 cross ; across)
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