---Jack fell off a ladder yesterday，but he's all right.---He's l

---Jack fell off a ladder yesterday，but he's all right.---He's lucky; he ____himself badly.
A、might hurt
B、could have hurt
C、must have hurt
D、should hurt
【正确答案】：B
【题目解析】：考查情态动词的完成式的用法。句意：——昨天杰克从自行车上掉下来了，但现在没事了。——真幸运！他可能会受伤的。由语境可知，空格处表示对过去情况的推测，应该在CD里面选择，could have done 意为“可能会…却没有”；should have done 意为“过去”应该干某事而没有干”。故B 项正确，