Many students signed up for the race in the sports meeting to be held next week.A. 800-me

问题补充：

Many students signed up for the race in the sports meeting to be held next week.

A. 800-metre-long

B. 800-metres-long

C. 800 metre length

D. 800 metres length

答案：

(答案→)A. 800-metre-long

B. 800-metres-long

C. 800 metre length

D. 800 metres length

解析：考察复合词的构词法。 数词 + 单数名词 + 形容词构成形容词,放在名词前作定语.其中的名词必须是单数.句意：在即将举办的运动会是哪个很多学生报名参加800米比赛。故A正确。