单选题 Difficult as it is, English study is in the long run ______ to a learner in his or her career development.

【正确答案】 A
【答案解析】advantageous有利的。句意：尽管英语学习很难，但从长远的观点来看，英语学习有利于学习者事业的发展。B．rewarding值得的；C．profitable有利可图的；D．earning收益，利润。