The Wilkerstein study demonstrates that even after three or four decades, senior former smokers still experience some of the ill health effects of habits quit as a young adult.
-
Aquit as a young adult
分析该选项
-
Bquitting when young adults
分析该选项
-
Cthat they quit as a young adult
分析该选项
-
Dthat they quit as young adults
分析该选项
-
Ethey quit as each was a young adult
分析该选项
显示答案
正确答案: D