The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health. A．involved B．being involvedC．having involvedD．-高中英语-n多题

◎ 题干

The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health.

A．involved

B．being involved

C．having involved

D．to be involved

◎ 答案

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◎ 解析

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◎ 知识点

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