The coach explained the regulations
at length
to make sure that none of his players would become violators.
A、
in general
B、
at best
C、
in detail
D、
at last
【正确答案】
C
【答案解析】
解析：题干：教练详细地解释了规则，以确保他的队员都不犯规。at length详细地，周密地；in detail详细地；in general通常，大体上；at best充其量，至多；at last最终。根据题意，本题选C。
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