摘要： The mother didn’t know who to b for the broken glass.
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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
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B. when
C. how
D. what
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
The mother didn't know who ________ for the broken glass as it happened.
A．to blame B．to be blamed C．blamed D．is to be blamed
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