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

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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 本题考查动词不定式的疑问式的用法。连接代词或副词+不定式构成了不定式的疑问式,在句子中可以做主语、宾语、表语或状语,如:Mr.Li taught us how to work out the difficult problem(李先生教我们如何解难题);Please tell me when to start(请告诉我伺时出发)。
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