◎ 题干
Because of too many differences between the two sides,  a lot of questions are still left ________.
A in the air      B on the air         C by the air      D through the air
◎ 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“Because of too many differences between the two sides, a lot of questions are still left ________.A in the airB on the airC by the airD through the air …”主要考查了你对  【介词和介词短语】  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。