My wallet is nowhere to be found.I_____it when I was on the bus.
D
musthave+done用于推断过去某个时间肯定发生了的事情。
Idon‘tfeellike_____anythingnow.
He didn‘t seem to mind_____the music while he was studying.
Your bike needs_____.You ‘d better do i right now.
Hedrovefastandarrivedanhour_____ofschedule.
The teacher gave_____the examination paper.
