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我正在尝试为来宾虚拟机配置一些代理，现在我得到：

sudo apt-get update
E: Syntax error /etc/apt/apt.conf.d/95proxy:4: Extra junk at end of file

该文件的内容是：

cat /etc/apt/apt.conf.d/95proxy 

Acquire::http::proxy  "http://10.0.0.60:3128/"
Acquire::ftp::proxy "http://10.0.0.60:3128/"
Acquire::https::proxy "http://10.0.0.60:3128/"