The thief ( ) in from the kitchen windows as all the other windows and doors were closed.
问题描述：
The thief ( ) in from the kitchen windows as all the other windows and doors were closed.
A.may climb B.must have climbed C.could climb D.should have climbed
答
首先should have done是表示该做的事却没做,表示对过去没做的事表示遗憾.shouldn't have done所表示的意思相反.could do和may climb是情态动词中便是现在,如果要表示过去则必须用have done表过去.as all the other...