单选题
1分
The coach explained the regulations 【at length】 to make sure that none of his players would become v...
The coach explained the regulations 【at length】 to make sure that none of his players would become violators.
参考答案: C
参考解析: 译文为：教练详细地解释了规则以确保任何一个队员都不会违反。at length充分地，详尽地。at last最终；at once马上；in detail详细地；in short简言之
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