单选题
If we had known that she had planned to go abroad today, we ______ at the airport. A. will see her off B. would see her off C. would have seen her off D. must have seen her off
【正确答案】
C
【答案解析】[解析] 本题考查非真实条件句中虚拟语气的用法。表示与过去事实相反的假设，从句谓语动词用had done的形式，主句谓语动词用would have done的形式。