Should it rain, the crops .
A. would be saved
B. would have been saved
C. will be saved
D. had been saved
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(答案→)A. would be saved
B. would have been saved
C. will be saved
D. had been saved
解析:本题中存在if虚拟语气省略现象,还原为if it should rain,从句对将来进行虚拟,主句用should + do。故选A