Tom ,clean up the broken glass ---someone walks on it A.since B.when C.before D.as

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Tom ,clean up the broken glass ---someone walks on it A.since B.when C.before D.as
Tom ,clean up the broken glass ---someone walks on it A.since B.when C.before D.as

Tom ,clean up the broken glass ---someone walks on it A.since B.when C.before D.as
C.before
Tom,在有人走上去之前,把碎玻璃清理掉.
clean up:清理