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    They sold ______ boxes of such sweets last week.

    A．four dozens ofB．four dozenC．four dozen ofD．four dozens

    B

    解析试题分析：考查数词的用法：dozen“二十”，前有数字时不加s,也不加of，用dozens of的时候dozen必须加s.表示“很多”，句意：上个星期，他们买了80盒这样的糖果。选B。
    考点：考查数词
    点评：一般情况下several或基数词后都用名词复数，但hundred，thousand，dozen，score这样的词，有具体数字修饰时，不能用复数，而加of时，就用复数。表示“许多”。

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