Is this your ____ ruler?No,it's hers.

问题描述:

Is this your ____ ruler?No,it's hers.
填冠词,

/(零冠词)
冠词分为不定冠词"a,an"、定冠词"the"和零冠词"(/)"三种,零冠词指的是不用冠词的情况.