题目内容
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．after obtaining | D．while obtaining |
A
解析试题分析：考查非谓语动词。句中的a difficult skill与obtain之间为被动关系，故用过去分词。句意：它是个很难掌握的技巧，但一旦被掌握，将对你的余生有好处。故A正确。
考点：考查非谓语动词
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