The mother didn’t know______to blame for the broken glass as it happened while s

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问题 The mother didn’t know______to blame for the broken glass as it happened while she was out.

选项 A、who
B、when
C、how
D、what

答案 A

解析本题考查宾语从句的用法。空格中需填入宾语从句的引导词。当从句中缺少主语、宾语或表语时，可用who，whom或what作引导词。其中what指代物，who指人(在从句中作主语)，whom指人(在从句中作宾语)。在本题中，从句缺主语，因此用who，A为正确选项。

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