题目内容

Usually, a mother wolf gives birth to five to seven baby wolves 　　　.
A．for a timeB．for the timeC．at the timeD．at a time
D

试题分析：句意：通常，一个狼妈妈一次生了五到七的狼崽at time是偶尔的意思；at a time指每次；for a time是暂时及一段时间的意思for the time是在当时。根据题意故选D.
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