1. The mother didn't know______to blame for the broken glass as it happened while she was out.A. who B. when C. how D. what(答案为A)为什么选A

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1. The mother didn't know______to blame for the broken glass as it happened while she was out.
A. who B. when C. how D. what(答案为A)
为什么选A

原句意思:妈妈不知道应该责怪谁打碎了盘子,因为这件事(打碎盘子)是在她离开的时候发生的.所以应该是“谁”即who.