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

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：虚拟语气省略if要提前助动词。