单选题 It is important that you reply to our letter without______.
【正确答案】 D
【答案解析】解析:delay n.耽搁,延误;推迟(without delay毫不迟延地,立即)。pause n.暂停,中止。stoppage n.停顿;堵塞。rest n.休息,睡眠:撑架。