问题补充:
Who do you think for the accident?
A. to blame
B. to be blamed
C. is to be blamed
D. is to blame
答案:
A. to blame
B. to be blamed
C. is to be blamed
(答案→)D. is to blame
解析:
be to blame表示“应该被责备”,为主动形式表示被动意义;句中do you think为插入语,解题时要设法通过分析句子结构排除插入语的干扰。