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高二英语The mother didn't know( )is to blame for the broken glas

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高二英语The mother didn't know( )is to blame for the broken glass as it happened
The mother didn't know( ) is to blame for the broken glass as it happened while she was out.
[ ]
A.who
B.when
C.how
D.what
请解释为什么是A?为什么其他选项是错误的?
高二英语The mother didn't know( )is to blame for the broken glas
和后面的blame 有关
主要是做blame 的宾语
从整句意思也不难看出 :妈妈不知道应该责备谁,因为玻璃碎的时候她出去了不在家.