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If we had known your new address, we ______ to see you.
A、came
B、would come
C、will come
D、would have come
【正确答案】：D
【题目解析】：本题考查虚拟语气。由if从句可知，从句表示与过去相反的事实，从句：主语+had done,主句：主语+would/could/should/might have done,根据公式选D。答案为D。