_______ it rain tomorrow，we would have to put off
_______ it rain tomorrow，we would have to put off the visit to Yangpu Bridge. A. Were B. Should C. Would D. Will
选B。 这是虚拟语气的用法特点之一，将来的虚拟条件句，谓语动词有三种形式：1）用过去形式；2）用were加不定式，既were to do；3）情态动词should加动词。后两种形式，可以省略if，而把were和should提前形成倒装句形式。
选B，Should才表示与将来相反的虚拟语气！_Should_ it rain tomorrow，是If it should rain tomorrow省略if,should提前。
本题选B。这是虚拟语气的省略句，原句为：If it should rain tomorrow,---.这是与将来相反的虚拟语气，也可以说，If it were to rain tomorrow,--.
原句应是If it would rain tomorrow,we would have to put off the visit to the Yangpu Bridge. 倒装后为Would it rain tomorrow,we would have to put off the visit to the Yangpu Bridge. 所以选C. 原句翻译为： 如果明天下雨,我们将不得不推迟去杨浦大桥。
A. Were 虚拟语气 如果明天下雨,我们将不得不推迟对杨莆桥的参观
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