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Mother dogs have several babies _______....

Mother dogs have several babies _______.

A. on a time    B. in a time    C. at any time    D. at a time

 

D 【解析】试题分析:句意:狗妈妈一次能生若干个狗宝宝。on a time 表示"上一次,在------时间";in a time 表示"在一段时间后,不久;at any time 随时;at a time作“一次,每次”讲,常用于“数词+at a time”的结构中。故选D。  
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