问题补充：
It is not I but Tom and his wife that for the car accident.
A. am to blame
B. are to blame
C. am to be blamed
D. are to be blamed
答案：
A. am to blame
(答案→)B. are to blame
C. am to be blamed
D. are to be blamed
解析：句意：不是我而是汤姆和他的妻子应为这次车祸负责。that for the car accident.是定语从句，谓语动词和先行词保持一致，先行词是Tom and his wife，是复数，所以系动词用are；且be to blame是应受责备，应对……负责。所以选B。
