Marcia skated()in last year's marathon.A.for one hour B.for one hour ago C.since one hour ago

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Marciaskated()inlastyear''smarathon.A.foronehourB.foronehouragoC.sinceonehouragoMarciaskated()inlasty

Marcia skated()in last year's marathon.A.for one hour B.for one hour ago C.since one hour ago
Marcia skated()in last year's marathon.A.for one hour B.for one hour ago C.since one hour ago

Marcia skated()in last year's marathon.A.for one hour B.for one hour ago C.since one hour ago
选择A,表示Marcia在去年的马拉松赛跑中滑雪花了一个小时
而不选择B是没有这个说法,要么是one hour ago
至于Csince一般都是用完成时

A