They will build bridge over the river.A. a 800-metres-longB. an 800-metre-longC. a 800-me

问题补充：

They will build bridge over the river.

A. a 800-metres-long

B. an 800-metre-long

C. a 800-metre-long

D. an 800-metres-long

答案：

A. a 800-metres-long

(答案→)B. an 800-metre-long

C. a 800-metre-long

D. an 800-metres-long

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