题目

根据课文内容完成下面语法填空，注意单词拼写和词语用法：Before Tangshan earthquake,strange things happened. A (有味道的) gas cameout from the cracks of wells and animals became (nerve). At 3:00 a.m., everything began to shake.It seemed that the world was at end. In fifteen seconds, a large city lay in (废墟), and the number ofpeople (受伤的) or killed reachedmore than 400,000. Water, food and (electric) were cut off and the railway trackswere (use) pieces of steel. But all hope was not lost.The rescue team (organize) by the army came to help those ( One day my family were having supper downstairs ________ he returned． [　　] A．after B．when C．before D．and