While three ______ ago , there were fewer than two books on time management, the most recent survey shows that there are over on

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问题 While three ______ ago , there were fewer than two books on time management, the most recent survey shows that there are over one hundred______books on this subject.

选项 A、decade ; dozen
B、decades ; dozens
C、decades ; dozen
D、decade; dozens

答案C

解析 decade“十年”,30年=3 decades。Dozen前面+具体数字时,dozen本身不+s。如题中的100 dozen。
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