◎ 题干

He knew the problem was serious and undertook to look into it       he reached  the office.
A.suddenlyB.immediatelyC.abruptly D.shortly
◎ 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“He knew the problem was serious and undertook to look into it he reached the office.A.suddenlyB.immediatelyC.abruptly D.shortly…”主要考查了你对  【副词的比较级】【疑问副词】【连接副词】【副词】  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。