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    6．While overall rates of sudden infant death syndromes（综合征） have decreased in recent years，deaths from sleep suffocation（窒息） ________ over the same time period．（　　）
    A．doubleB．have been doubling
    C．have doubledD．doubled

    分析 虽然婴儿突然死亡综合征的总比率近几年已经下降，而同一时期因为睡眠窒息而死亡的数量加倍了．

    解答 答案是C．本题考查现在完成时．句中over the same period指代的是上文的recent years，是与现在相联系的段时间，用现在完成时，故选C．现在完成进行时表示动作仍在进行中，而本题中double的动作已经发生，故排除B．

    点评 对时态的选择，要在把握时态的基本用法的基础上，根据具体语境和题干中的时间推断时态，同时关注特殊的结构．

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