They have been waiting for many hours to see the singer, but the airplane must have been _____.A.behind the timesB.behind scheduleC.ahead of timeD.in no time
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B解析考查短语意思辨析。behind schedule(=late, behind time)晚点；behind the times过时，跟不上时代，落后；ahead of time提前；in no time(=soon, quickly)立即，马上。