(·天津南开中学高三二模) it rain tomorrow we should have to put off the visit to the Yangpu Bri

问题补充：

(·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

答案：

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。