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：句意杰克昨天从梯子上掉下来了，但是现在好了。--真幸运！他本来会受伤严重的。因为是说明过去的事情，所以排除AB， --could have done 表示“本来可能而实际未……”。Should have done过去本应该做而没有做，根据句意应选 D。