Question

that did great harm to the health and mental quality of those______

Answer 1

That did great harm to the health and mental quality of those____________.
A. who addicted to the drug
B. who were addictied to the drug
答案：B
分析：addict 有名词和动词两种形式。
做名词时，指入迷的人。
做动词讲时，有"使沉溺; 嗜好使...成瘾, 热中于"的意思。
有固定的句型“be addicted to”嗜好, 热中

Answer 2

当先行词是those(那些人）时关系代词不用that，要用who。addict使上瘾，当人作主语时应该用被动语态。故空白处正确选项是：who were addicted to the drug。