单选题 ______ ,we should be glad. A. They arrive tomorrow B. Were they arriving tomorrow B. They were to arrive tomorrow D. Were they to arrive tomorrow
【正确答案】 D
【答案解析】[解析] 本题考查虚拟语气用法。表示将来时的虚拟语气，从句助动词用were to/should。如果 if省去，从句需用倒装。句意为：如果他们明天到了我们将很高兴。