---Mary knocked into a tree last night while driving, but she is all right.
---She is lucky. She herself badly.
A. should injure
B. might injure
C. should have injured
D. could have injured
网友回答
A. should injure
B. might injure
C. should have injured
(答案→)D. could have injured
解析： 句意：--玛丽昨晚开车的时候撞到了树上，但是她没事。--她很幸运，她本来可能伤的很严重的。因为玛丽没事，所以伤的严重只是虚拟语气，因为是对过去的虚拟，所以排除AB，should have done本应该做而没做，不符合句意，could have done过去本可能做而没做，所以选D。