Analyzing campaign expenditures, the media has had as a focus the high costs and low ethics of campaign finance, but they have generally overlooked the cost of actually administering elections, which includes facilities, transport, printing, staffing, and technology.

1. Analyzing campaign expenditures, the media has had as a focus
2. Analyses of campaign expenditures by the media has been focus on
3. In analyzing campaign expenditures, the media have focused on
4. Media analyses of campaign expenditures have had as a focus
5. In their analysis of campaign expenditures, the media has been focusing on

答案是C，可是为什么用have呢？请大家帮忙