The coach explained the regulations
at length
to make sure that none of his players would become violators.
A、
at last
B、
at once
C、
in detail
D、
in short
【正确答案】
C
【答案解析】
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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