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    【题目】He didn't visit his parents living in Toronto regularly, only __________.

    A. again and again

    B. time and time

    C. now and then

    D. since then

    【答案】C

    【解析】now and then相当于sometimes, 意为“有时，偶尔”；again and again 和 time and time 都译为“一次又一次地，一再”；since then 意为“自从那时”。

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