【解答】很高兴在这里给你解答问题。I don't know which book I shall choose.同义句子转换
I don't know which book to choose.
分析句子成分如下
I 主语
don't know谓语
which to choose.复合不定式(相当于一个名词)作宾语
动词复合不定式构成:疑问代词/疑问副词+to+动词原形
例如 how to go,what to buy,what to want,when to meet,where to see,which one to buy
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