单选题 We were heartedly arguing about the financial matter, ______the telephone rang unexpectedly. A. while B. as C, when D. as soon as

【正确答案】 C

【答案解析】本题测试连词的区别。when表示“这时候”，符合句意。而while所引导的从句中谓语动词往往是延续性的。本句大意为；在我们讨论财政问题的过程中，电话突然响了起来。