Question

【题目】Something terrible (一定发生了) if Li Chang was not coming to eat in his restaurant as he always did.

Answer 1

【答案】must；have；happened
【解析】句意：如果李畅不象平常一样到他的饭店吃饭，一定发生了可怕的事情。must have done对过去事情有把握的肯定的推测，表示“一定是做某事了”。所以答案是must have happened。