If it _________ that day, we would have finished it because we had already got everything ready．A.didn’t rainB.haven’t rainedC.hadn’t rainedD.don’t rain
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C解析题意是“如果那天不下雨，我们会完成任务的，因为我们已经把每一样东西都准备好了。”从that day和would have finished it看出是与过去情况有关的虚拟语气，条件从句应该用过去完成时态。