My wallet is nowhere to be found.I_____it when I was on the bus.
A、mustdropD
musthave+done用于推断过去某个时间肯定发生了的事情。
Thereisn‘tmuchmilk_____isleftinthebottle.
_____hespeakssoftlyisnoproofthatheiskind.
Childrenwhoareover-protectedbytheirparentsmaybecome_____.
_____alltherepresentativesstillnotthere，themeetingwaspostponedforseveralhours.
“Itwasverycoldtesterday.”
“_____.”
