题目内容：

Jim skated _______a marathon last year.A.at B.in C,on D.for

优质解答

in a marathon 在马拉松比赛中 固定短语
例句.在马拉松比赛中,胜利的关键是耐力和平衡的节奏.
In a marathon,the key to victory is stamina and a balanced pace.