问题
选择题
—Jack fell off the ladder yesterday，but he is all right now.
—What a lucky dog! He________ himself badly.
A．should injure
B．might injure
C．should have injured
D．could have injured
答案
答案：D
题目分析：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D 项正确，