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The thief ( ) in from the kitchen windows as all the other w

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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
The thief ( ) in from the kitchen windows as all the other w
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 windows and doors were closed注意到是“were”说明表示的过去.
must have done表示对过去的判断和推测的肯定语气.