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【题目】Mother dogs have several babies _______.

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

【答案】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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