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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．to be involved
A

試題分析：本題實(shí)際上考察了一個(gè)固定搭配be involved in…參與…卷入….，致力于…；其中的involved是一個(gè)形容詞，本句中形容詞短語involved in his new book in the past three years是對句中主語The retired professor的情況進(jìn)行的說明。句義：那位在過去三年里致力于新書的退休教授還沒有意識到自己健康方面的下降。故A正確。
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