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答： B. Every few days 每几天 译：你多久去一次图书馆？隔几天就去一次。析：每N天一次：every N days 。N为序数词,如every five days。也可以用基数词如：every fifth day.every 不能用each，排除C every和a 为中位限定词，不能同时使用。排除D（ every 与a同义，如：once a day, on...

every few days=每隔几天 依此类推

D 试题分析：考查冠词固定词组。On duty值日；every few days每几天；句意：在我们班级里，班长每几天就值日一次。故D正确。点评：On duty值日；every few days每几天；冠词要注意the表示特指，a/an表示泛指的用法和一些固定结构。

单数名词，均表示“每(多少)”。例句：：every three days（every third day），每三天或每隔两天；every other+单数名词，意思是“每隔一...”，例句：every other day ，每隔一天；every other tree ，每隔一棵树；every few+复数名词，意思是“每隔几...”如：every few days（每隔几天）...

every+ 基数词+ 复数名词=every+ 序数词+ 单数名词，均表示“每(多少)”。例句：：every three days（every third day） ，每三天或每隔两天；every other+单数名词，意思是“每隔一...”，例句：every other day ，每隔一天； every other tree ，每隔一棵树；every few+复数名词，意思是“每隔...

5、every+基数词+复数名词=every+序数词+单数名词，作“每(多少)”解；6、everytwodays，everysecondday都作“每隔一天”解，但在实际应用中人们都用everyotherday来表示这一意思，everytwodays也有人讲，而everysecondday则少用的；7、everyfewdays，相当于汉语的“隔些日子”；8、every作形容词时更...

3. The terms "every two days" and "every second day" both express the meaning of "每两天."4. "Every few days" can be used to express "隔几天一次" or "每隔几天."5. When "every" is used with "not," it forms a partial negative, which means "not every" or "some,...

fourth year =every four years every four years 每个四年(每隔四年)Olympic is held every four years.every 与基数词、序数词、other 和few 连用，表示时间或空间的间隔，意为“每……；每隔……”。如：He comes here every three days (every third day).他每三天(每隔两天)来这儿一次。You...

不用,every和each一样，后面接单数