问题补充：
Not only Jack but also his parents the home accident.
A. is to blame on
B. are to blame for
C. is blamed for
D. are to be blamed for
答案：
A. is to blame on
(答案→)B. are to blame for
C. is blamed for
D. are to be blamed for
解析：这道题考查主谓一致，主语由Not only…but also连接，用就近原则，即和his parents一致，所以谓语用复数，另外也考了词组“sb be to blame for” 的用法，句意是：不仅Jack而且他的父母都要为家里的事故受责备。
