问题补充：
--- 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：
A. should injure
B. might injure
C. should have injured
(答案→)D. could have injured
解析：可联系答.案.网客服索取。
