引导名词性从句What和Which都能用吗?有什么区别?
问题描述：
引导名词性从句What和Which都能用吗?有什么区别?
答
在北京了. Where have you been since I last saw you? 自上次我和你见面以后,你到哪里去了? It is four years since my sister lived in Beijing. 我妹妹不在北京住有四年了. It is five months since our boss ...