one of the first step is to. 为什么用is?are吧
问题描述：
one of the first step is to. 为什么用is?are吧
答
one of the first step is to...
在此句中主语是单数one of *** ,意思是其中之一,所以用is,不用are
若是some of ***,则是复数用are,例如some of them are students.