Question

___________ it rain tomorrow, we would have to put off the visit to the Yangpu Bridge.

1. A.
   Were
2. B.
   Should
3. C.
   Would
4. D.
   Will

Answer 1

B
解析：
含有if的虚拟条件句可把if省略，而把had，should，were等提到句首，构成倒装。