(2013·天津南开中学高三二模) it rain tomorrow, we should have to put off the visit to the Yangpu Bridge.
A. Were
B. Should
C. Would
D. Will
网友回答
A. Were
(答案→)B. Should
C. Would
D. Will
解析：选B 句意：如果明天下雨，我们应该推迟参观杨浦桥。从句表示与将来事实相反的虚拟语气，用一般过去时、should加动词原形或were to加动词原形，且should或were可以提前。