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

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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
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