He spent his whole life (popular) ______his new approach to teaching.

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问题 He spent his whole life (popular) ______his new approach to teaching.

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答案popularizing

解析短语spend time doing sth．是“花费时间做某事”的意思。在这个短语中，doing是动词的-ing形式。popular是形容词，其动词-ing形式是popularizing。

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大学英语三级A级

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