单选题
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] 句意：教练详细地解释了格则，以确保他的队员都不违规。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。
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