—Do you think the thief entered through the back door?
—No, if he had, I don’t believe he the living-room window.
A. would break
B. broke
C. would have broken
D. had broken
网友回答
A. would break
B. broke
(答案→)C. would have broken
D. had broken
解析：考查情态动词用法。句意：—你认为小偷是从后门进来的吗？—不，如果他从后门进来，我认为他不会打破起居室的窗户。根据句意说明是对过去事实的推测，对过去情况进行推测使用“情态动词+have done”的形式。故C正确。