问题
选择题
They have been waiting for many hours to see the singer, but the airplane must have been _____.
A．behind the times
B．behind schedule
C．ahead of time
D．in no time
答案
答案：B
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。