Usually, a mother wolf gives birth to five to seven baby wolves .A. for a timeB. for the t

Usually, a mother wolf gives birth to five to seven baby wolves .
A. for a time
B. for the time
C. at the time
D. at a time

A. for a timeB. for the timeC. at the time(答案→)D. at a time解析：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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