They were so tired that they had to stop to have a rest ________.A.every other hourB.every second hoursC.in two o’clockD.every a few hours
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A解析1．every+基数词+名词复数。例如：every two days每两天(每隔一天)2．every+序数词+名词单数。例如：every second day每两天(每隔一天)(=every two days)3．every + few+名词复数，表示“每几……”。例如：every few years每几年4．every + other+名词单数，表示“每两……；每隔一……”。例如：every other line每两行(每隔一行)