Question

They were so tired that they had to stop to have a rest ________.

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A．every other hour	B．every second hours
C．in two o’clock	D．every a few hours

Answer 1

答案：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)