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。
Theteachergave_____theexaminationpaper.
_____hespeakssoftlyisnoproofthatheiskind.
Iwilldotheclearingifyousee_____thelunch.
Thedriverpulled_____atthetrafficlights.
Itwasnotuntilshehadfinishedallherwork_____.