◎ 题干
_The work is easy for an expert _______it is difficult for an inexperienced person.
A.becauseB.therefore
C.whileD.unless
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“_The work is easy for an expert _______it is difficult for an inexperienced person.A.becauseB.thereforeC.whileD.unless…”主要考查了你对  【并列连词】【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。