The river through our city, which is about , is clean again. A. 6000 metres long B. 6000-metre——青夏教育精英家教网—

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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

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