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】

試題分析：考查時間狀語從句的省略結(jié)構(gòu)。本題中主句是happiness is like a butterfly，which is always beyond our grasp是做butterfly的非限制性定語從句，when引導(dǎo)的是時間狀語從句，且是省略主語的形式，從句的主語就是主句的主語即是happiness，快樂應(yīng)是被追逐，動詞ed形式是表被動，動詞ing形式是表主動，句意：有句諺語“快樂就像蝴蝶，當(dāng)你追逐它時，你總是抓不住，但如果你安靜地坐著，快樂也許會降臨�！�。故選B

考點(diǎn)：考查時間狀語從句

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