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It’s a difficult skill to master, but ______, it will benefit you for the rest of your life.

A．once obtained B．when to obtain  
C．a(chǎn)fter obtaining D．while obtaining 

A

解析試題分析：考查非謂語動詞。句中的a difficult skill與obtain之間為被動關(guān)系，故用過去分詞。句意：它是個(gè)很難掌握的技巧，但一旦被掌握，將對你的余生有好處。故A正確。
考點(diǎn)：考查非謂語動詞

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