◎ 题干
My father _____ the Party _____ he was 22 years old.         

A. joined;  at        
B. joined;  when        
C. joined in;  when        
D. joins;  when
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“My father_____the Party_____he was 22 years old.[ ]A. joined ; at B. joined ; when C. joinedin ; whenD. joins ; when…”主要考查了你对  【实义动词的过去式】【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。