Question

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

Answer 1

D

解析:

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。