A great many people paid attention to the race in the sports meeting to be held next quarter.
A. 800-metre-long
B. 800-metres-long
C. 800 meter length
D. 800 meters length
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(答案→)A. 800-metre-long
B. 800-metres-long
C. 800 meter length
D. 800 meters length
解析：考查复合形容词：句意：很多人注意下个季度将举行的运动会的800米赛跑。800-metre-long是复合形容词，单词之间需要连词符，名词metre应该是单数。选A。