The Prime Minister and Party leader has resigned office
问题描述：
The Prime Minister and Party leader has resigned office
这句话用has还是have,算不算单三.用and连接时,什么情况下算单三
答
用has ,The Prime Minister and Party leader表示的是一个人,这个人既是总理又是党的领袖.这里是单三,如果是The Prime Minister and the Party leader表示的就是两个人,这时得用have