请教英语好的朋友,一个词性转换的题目Whenever he encounters a problem,he is _____ in deep and careful thinking.(absorb)

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请教英语好的朋友,一个词性转换的题目
Whenever he encounters a problem,he is _____ in deep and careful thinking.(absorb)

absorbed.
be absorbed表示“聚精会神地干某事”,之后应接“in+动名词”,不能接动词不定式.