单选题They have been waiting&nb

问题补充：

单选题Theyhavebeenwaitingformanyhourstoseethesinger,buttheairplanemusthavebeen_____.A.behind the timesB.behind scheduleC.ahead of timeD.in no time

答案：

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。