There is a ___river A.6000-metre-long B.6000 metre long C.6000-metres-long D.6000-metres long在解释一下.谢谢!

There is a ___river A.6000-metre-long B.6000 metre long C.6000-metres-long D.6000-metres long在解释一下.谢谢! The Yellow River is the second ___river in China.为什么填写Longest The Yellow River is the second ___river in China.为什么不填写longer Is there a window? There is a middle there is a cat there is a problem Is there a school Is there a house___? There is a Is there a. there is a There is a kitshen. There is a pair the river is the longest in the whole country.the river is longer than ___ __　___river in the whole country. over is village a there there (.) There is a long r______ there. There( )(be)a football match,is there.