It’s quite impossible that it will rain tomorrow. But if it , I would still go to the park.
A. should rain
B. would rain
C. rains
D. had rained
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(答案→)A. should rain
B. would rain
C. rains
D. had rained
解析：考查虚拟语气。考查与将来事实相反的虚拟语气，从句用should + V原形/过去时/were to + v原形。故选A。