Usually, a mother wolf gives birth to five to seven baby wolves .A．for a time
题型：不详难度：来源：
| A．for a time | B．for the time | C．at the time | D．at a time |
|
答案
| D |
解析
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. |
举一反三
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