问题标题:
Tom,cleanupthebrokenglass---someonewalksonitA.sinceB.whenC.beforeD.as
问题描述:
Tom,cleanupthebrokenglass---someonewalksonitA.sinceB.whenC.beforeD.as
沈安东回答:
C.before
Tom,在有人走上去之前,把碎玻璃清理掉.
cleanup:清理
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