The doctor told me to take the medicine .
A. every fourth hours
B. each fourth hour
C. each four hours
D. every four hours
网友回答
A. every fourth hours
B. each fourth hour
C. each four hours
(答案→)D. every four hours
解析：every＋基数词＋复数名词=every+序数词+单数名词 如every four hours =every fourth hour 表示每四个小时或每隔三个小时译成“每隔……”时，汉语和英语不同，要在英语所给数字中减去一，即（n-1），故应该选D。句意：医生告诉我每四个小时吃一次药。