it rain tomorrow, we would have to cancel the football match.
A. Were
B. Would
C. Should
D. Will
网友回答
A. Were
B. Would
(答案→)C. Should
D. Will
解析：句意：如果明天下雨，我们就不得不取消足球比赛。根据主句的would have to…，可知这是和将来相反的虚拟条件句，条件句的谓语可以用should do/did/Were to do，也可以省略if，提前should，were，但是如果是were的话，it后面要有to，所以选C。