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It has been said that “happiness is like a butterfly, which, when _ _, is always beyond our grasp but which, if you will sit down quietly, may alight upon you."

A. pursuing B. pursued

C. to pursue D. having pursued

B

【解析】

试题分析:考查时间状语从句的省略结构。本题中主句是happiness is like a butterfly,which is always beyond our grasp是做butterfly的非限制性定语从句,when引导的是时间状语从句,且是省略主语的形式,从句的主语就是主句的主语即是happiness,快乐应是被追逐,动词ed形式是表被动,动词ing形式是表主动,句意:有句谚语“快乐就像蝴蝶,当你追逐它时,你总是抓不住,但如果你安静地坐着,快乐也许会降临。”。故选B

考点:考查时间状语从句

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