试题：
These plants are water _______.
A．each other day 　B．every other day
C．each of two daysD．every of two days
不定代词, 人称代词, 疑问代词, 相互代词, 关系代词 2016-05-28

答案：

我来补答
B
 每隔几天/周/月的表达是：every few days/ weeks/months。每隔一天是： every other day
 
 
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