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

8个回答

  • 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 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.