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

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：

试题分析:句意：万一明天下雨的话，我们将不得不推迟去杨浦大桥的参观。根据主句would have to可知此句是对将来的虚拟，主句用would+动词原形，从句用should/were to do+动词原形，而从句可以省略if，把should或were提前，故答案选B。