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。
Ifhe_____thestorekeeper‘sscissors，hewouldhaveforgottentobuyapair.
_____youunderstandthisrule，you‘llhavenodifficultyindealingwithsuchproblems.
Mywalletisnowheretobefound.I_____itwhenIwasonthebus.
Childrenwhoareover-protectedbytheirparentsmaybecome_____.
“Itwasverycoldtesterday.”
“_____.”
