问题描述：
Many students signed up（报名）for the__a___ race in the sports meeting to be held next week.
A.800-meter-long B.800-meters-long C.800 meter length D.800 meters length
为什么不选b
A.800-meter-long B.800-meters-long C.800 meter length D.800 meters length
为什么不选b
问题解答：
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