I really didn’t know who for the broken window, for none of them admitted that he had don

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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 Jack's 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。