The mother did not know to blame for the broken window as it happened while she
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The mother did not know ________ to blame for the broken window as it happened while she was out．
[]A．what
B．who
C．when
D．how
试题答案
答案：B
解析：根据句意应当是窗户打碎了，妈妈不知道该责备谁，因为窗户打破时她不在家。