It’s a difficult skill to master, but ______, it will benefit you for the rest of your life.
A．once obtainedB．when to obtain
C．a(chǎn)fter obtainingD．while obtaining
A

試題分析：考查非謂語(yǔ)動(dòng)詞。句中的a difficult skill與obtain之間為被動(dòng)關(guān)系，故用過(guò)去分詞。句意：它是個(gè)很難掌握的技巧，但一旦被掌握，將對(duì)你的余生有好處。故A正確。
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