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_____.
Those people_____a general understanding of the present situation.
“It was very cold testerday. ”
“_____.”
Childrenwhoareover-protectedbytheirparentsmaybecome_____.
Theteachergave_____theexaminationpaper.
