问题补充：
I really didn’t know who for the broken window, for none of them admitted that he had done it.
A. was to be blamed
B. was blamed
C. was to blame
D. was blaming
答案：
A. was to be blamed
B. was blamed
(答案→)C. was to blame
D. was blaming
解析：考查时态和语态。句意：我不知道该责备谁打破了玻璃，因为他们没有一个人承认。 这里的主语是I 相当于I to blame who ，who是疑问词提到前面，sb be to blame 是被责备的人是主语。blame的两个意思，一个是表示主动的指责某人,一个是含有被动含义的应负责任 ，前者当然有被动形式,意思是被指责,后者则是以不定式的形式出现。blame作动词的主要用法：①blame sb. for sth. /doing sth. 为某事责备某人/责备某人做了某事。如: Many children are afraid of being blamed for making mistakes in speaking English. 许多孩子害怕讲英语时犯错误而受责备。②blame sth. on sb. 把某事归咎于某人。如: The police blamed the traffic accident on Jacks careless driving. 警察把那起交通事故归咎于杰克的粗心驾驶。③ be to blame (for)应(为……)承担责任;该(为……)受责备。[注意]此处不能用被动语态。如: The children were not to blame for the accident. 那次事故怪不着孩子们。 故选C。
