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。
Itwasnotuntilshehadfinishedallherwork_____.
Williamhascuthissmoking_____tofivecigarettesaday.
Thedriverpulled_____atthetrafficlights.
It‘s_____mypowertomakefinaldecisiononthematter.
He‘sworkinghard_____.
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