A. in good health B. in the past C. in the wrong D. the old man E. a middle-aged man F. a young man More research should be don

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问题 A. in good health
B. in the past
C. in the wrong D. the old man
E. a middle-aged man
F. a young man
More research should be done on the experiences of______.

选项

答案D

解析
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