问题
选择题
The thief ________ in from the kitchen window as the door was closed.
A.may climb
B.must have climbed
C.could have climbed
D.should have climbed
答案
D
问句中使用了过去时态,说明动作发生在“过去”;A、C项表示“现在”或者“将来”,排除。must不能和完成时一起用于疑问句,排除。这里should have done表示应该做某事而没有做,带有批评的口气。