it rain tomorrow we would have to put off the visit to the Yangpu Bridge. A. WereB. Sho

问题补充：

it rain tomorrow, we would 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：句意：如果明天下雨，我们将不得不取消参观杨浦大桥。前半句是对将来情况的虚拟，正常语序是If it should rain tomorrow。省略 if 后，要将 should提到主语之前，引起倒装。所以选B。