As a young man, Zhou Enlai the students movements and later the Communist Party of China

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A. joined; took part in
(答案→)B. took part in; joined
C. joined in; took part in
D. took part in; joined in
解析：join作“参加”解时,其含义是以非发起人和非主办人的身份加入到业已存在的组织(如军队、党团、社团协会等)或正在进行的某种集体活动(如游戏、比赛、讨论、演唱等)中去,成为其中的一员或伙伴。join所表示的“参加”的特点在于参加者与接纳者的地位、作用是平等的。take part in指参加一项工作,在其中分担一部分,也指参加活动并积极工作。故选B。