I took part in the in the sports meeting last week.A. 800-meter-longB. 800-meters-longC.

问题补充：

I took part in the in the sports meeting last week.

A. 800-meter-long

B. 800-meters-long

C. 800 meter long

D. 800 meters long

答案：

(答案→)A. 800-meter-long

B. 800-meters-long

C. 800 meter long

D. 800 meters long

解析：考查复合形容词作定语的应用。题意为：上周我参加了运动会中的800米跑比赛。其构成结构为数词 +连字符号+名词单数+连字符号+形容词。故选A。