【题目】Microsoft reached an agreement which will allow its Windows operating system, which most people are f with, to work with the open source Linux system.
在线课程【答案】familiar
【解析】句意：微软达成协议将允许其大多数人都很熟悉的windows操作系统使用开源的linux系统。be familiar with固定短语，”对......熟悉“，所以答案是familiar。