—Do you think the thief entered through the window?
—No, if he had, I don’t believe, broken the living-room’s window.
A. he would have
B. he must have
C. he had
D. should he have
网友回答
A. he would have
B. he must have
C. he had
(答案→)D. should he have
解析：考察虚拟语气.句意:你认为贼是从窗户进来的吗?_不,如果是,我不相信,他本来可以打碎客厅窗户的.(客厅窗户较低,容易进), “should+have+done”意思是“本来应该做某事，而实际没做,此处为倒装语序,故选D.