Mother dogs have several babies _______.

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

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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