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。