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。
“Itwasverycoldtesterday.”
“_____.”
Icanspeak_____German.
Bothofmybrothersarenowmarried，soIhavetwo_____.
Yourbikeneeds_____.You‘dbetterdoirightnow.
Ifhe_____thestorekeeper‘sscissors，hewouldhaveforgottentobuyapair.
