A-A+ In the advanced course students must take perf 2022-08-05 18:57:17 问答库 阅读 171 次 问题详情 In the advanced course students must take performance tests at monthly ________.A) gapsB) intervalsC) lengthD) distance请帮忙给出正确答案和分析,谢谢! 参考答案 正确答案:B