________itraintomorrow,wewouldhavetocancelthefootballma...

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________ it rain tomorrow, we would have to cancel the football match.

Should　本句中条件句是对将来状况的虚拟，当条件句中有助动词had, were, should时，可以将if省略，把这些助动词放在句首，构成倒装结构。