同学你好，该知识点来自沪江网校《英语零基础直达大学六级【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
most of us thought 是主句
the sand had come from an ancient mountain range fairly close by that flattened out over time 是宾语从句
其中，fairly close by是定语，修饰an ancient mountain
that flattened out over time是定语从句，也修饰an ancient mountain

mountain range 山脉

close by 在附近
fairly close by 很靠近
Did a new hairdressing shop open close by?
附近是不是新开了一家理发店？

祝同学学习进步~