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
网友回答
(答案→)A. involved
B. being involved
C. having involved
D. to be involved
解析：本题实际上考察了一个固定搭配be involved in…参与…卷入….，致力于…；其中的involved是一个形容词，本句中形容词短语involved in his new book in the past three years是对句中主语The retired professor的情况进行的说明。句义：那位在过去三年里致力于新书的退休教授还没有意识到自己健康方面的下降。故A正确。