单选题 ______ before we departed last weekend, we would have had a wonderful dinner party.
A. Had they arrived B. Would they arrive
C. Were they arriving D. Were they to arrive

【正确答案】 A

【答案解析】本题测试虚拟语气省略if的倒装形式。根据后面的主句谓语would have had可知，本题是对过去事实的虚拟，故从句谓语形式应用had done的形式，故答案为A。