问题补充：
The children for the accident. After all, they were so young.
A. should not be to blame
B. not to be blamed
C. were not to blame
D. were to not blame
答案：
A. should not be to blame
B. not to be blamed
(答案→)C. were not to blame
D. were to not blame
解析：考查词组：be to blame“应受责备“，这个词组是主动表示被动，否定式Be not to blame、句意是：孩子们不能为了这件事受责备，毕竟他们还很年轻。选C。
