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,在句子中可以作主语、宾语、表语和状语。如:Mr. Li taught us how to work out the difficult problem. 李先生教我们如何解难题。本句的意思是:“杯子摔碎了,妈妈不知道该责备谁,因为当时她出去了。”
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