Many students joined in the race in the sports meeting to be held next week.A. 800-meter-

问题补充：

Many students joined in the race in the sports meeting to be held next week.

A. 800-meter-long

B. 800-meters-long

C. 800 meter long

D. 800 meters length

答案：

(答案→)A. 800-meter-long

B. 800-meters-long

C. 800 meter long

D. 800 meters length

解析：考查形容词。800-meters-long 那个‘s’要去掉，因为用了短线。这个复合词复数的表现已经出现在800上面了，meter就没必要变复数了，只是表现一个属性。句意：许多学生参加下个周举行的运动会800米长跑。