At the end of the race his legs ____ and he fell down on the groundA.gave outB.gave offC.worn outD.used up
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A解析试题分析：考查动词短语：A. gave out用尽，耗尽，精疲力竭（不及物动词短语）B. gave off散发， C. worn out用尽，（这是过去分词的形式，不能做谓语）D. used up用完（及物动词短语），句意：在比赛结束的时候，他的腿精疲力竭，倒在地上。选A。考点：考查动词短语