【題目】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】試題分析:句意:狗媽媽一次能生若干個(gè)狗寶寶。on a time 表示"上一次,在------時(shí)間";in a time 表示"在一段時(shí)間后,不久;at any time 隨時(shí);at a time作“一次,每次”講,常用于“數(shù)詞+at a time”的結(jié)構(gòu)中。故選D。

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