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    【题目】I haven't seen Anna since she left our hometown two years ago, but we do keep in touch with each other by sending e-mails __________.

    A. here and there

    B. sooner or later

    C. at one time

    D. now and then

    【答案】D

    【解析】now and then 意为“有时，偶尔”。句意：自从两年前安娜离开我们的家乡我就没见过她，但我们的确有时发电子邮件来保持联系。here and there “到处”；sooner or later “迟早”；at one time “一度，过去有一段时间”。

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