问题
选择题
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
答案：B
强调句型，强调部分为not…but…, not…but…连接两个名词作主语时谓语动词与but后面的主语保持一致；sb be to blame主动表被动，因此选B。