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He didn't know to choose which one.该为He didn't know which one to choose.求原因?one后为什么加to

题目详情
He didn't know to choose which one.该为He didn't know which one to choose.求原因?one后为什么加to
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答案和解析
choose为动词,用to接动词,to choose为不定式作one这个不定代词的后置定语