◎ 题干

While typing, Helen has a habit of stopping ______ to give her long and flowing hair a smooth.
A  now and then     B.over and over     C.up and down    D.here and there
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“While typing, Helen has a habit of stopping ______ to give her long and flowing hair a smooth.A now and then B.over and over C.up and down D.here and there…”主要考查了你对  【动词短语】  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。