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Amanescapedfromtheprisonlastnight.Itwasalongtime_____theguardsdiscoveredthat.A.whenB.untilC.sinceD.before
题目
Amanescapedfromtheprisonlastnight.Itwasalongtime_____theguardsdiscoveredthat.
A.when
B.until
C.since
D.before