成人英语三级

单选题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

参考答案:A进入在线模考
【参考译文】杯子摔碎了,妈妈不知道该责备谁,因为当时她出去了。
【答案解析】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(请告诉我何时出发)。

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