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The study, called the National Lung Screening Trial, focused on a specific high‐risk group: 53,000 current and former heavy smokers, aging from 55 to 74, which had smoked for at least 30 pack‐years A. group: 53,000 current and former heavy smokers, aging from 55 to 74, which had smoked for at least 30 pack‐years B. group: 53,000 current and former heavy smokers, aged 55 to 74, that had smoked for at least 30 pack‐years C. group: 53,000 current and former heavy smokers, aged 55 to 74, who smoked for at least 30 pack‐years D. group: 53,000 current and former heavy smokers, aged 55 to 74, who had smoked for at least 30 pack‐years E. group: 53,000 current and former heavy smokers, who were aged 55 to 74,and who had smoked for higher than at least 30 pack‐years
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This one is relatively easy. Since "heavy smokers" are people correct reference in modifiers is "who". Hence A, B are out leaving with C,D, and E. Looking at E "who were aged" is incorrect since it means ages in the past. and the last phrase is unnecessarily wordy => "higher than atleast 30"? Leaving out C and D. Since "had been smoking" is correct to denote the first action D is correct.
The study, called the National Lung Screening Trial, focused on a specific high‐risk group: 53,000 current and former heavy smokers, aging from 55 to 74, which had smoked for at least 30 pack‐years A. group: 53,000 current and former heavy smokers, aging from 55 to 74, which had smoked for at least 30 pack‐years B. group: 53,000 current and former heavy smokers, aged 55 to 74, that had smoked for at least 30 pack‐years C. group: 53,000 current and former heavy smokers, aged 55 to 74, who smoked for at least 30 pack‐years D. group: 53,000 current and former heavy smokers, aged 55 to 74, who had smoked for at least 30 pack‐years E. group: 53,000 current and former heavy smokers, who were aged 55 to 74,and who had smoked for higher than at least 30 pack‐years
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.