Competitors are allowed to take a five-minute break every hour to eat，drink or do ________ is necess...
2022-12-19 08:23:26 159次 2012-2013学年山东省高三下学期第二次模拟考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Competitors are allowed to take a five-minute break
every hour to eat，drink or do ________ is necessary
A．which B．that C．where D．what
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