◎ 题干
I want to ring him___to know the reason why he rang___while I was speaking yesterday.
A.up; offB.back; up C.up; downD.on; off
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I want to ring him___to know the reason why he rang___while I was speaking yesterday. A.up; offB.back; up C.up; downD.on; off…”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。