Mywalletisnowheretobefound.I_____itwhenIwasonthebus.
A、mustdropD
must have+done 用于推斷過去某個時間肯定發(fā)生了的事情。
Thosepeople_____ageneralunderstandingofthepresentsituation.
He drove fast and arrived an hour_____of schedule.
Being extremely_____to the cold ，I do not like skating.
The driver pulled_____at the traffic lights.
Itwasnotuntilshehadfinishedallherwork_____.
