重生之骄傲妻主独宠夫:一道英语选择题

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The teacher ___ .
A.bought two dozen copy books for his pupils
B.bought two dozen of these copy books for his pupils
C.bought two dozens of copy books his puplis
D.bought two dozen of these copy books at his pupils
标准答案是B。请问为什么不能选择A?

因为这里的Dozen实际上充当的不是数量词,而是相当于单位,有点类似于pieces的作用,所以要跟介词of才能修饰后面的名词

becausebooksis复数前面必须加of