that lay below that Though,at first,Byrd and his men were able to take a great many photographs of the mountains that lay below,that 什么情况用that?
问题描述：
that lay below that
Though,at first,Byrd and his men were able to take a great many photographs of the mountains that lay below,
that 什么情况用that?
答
这里是做the mountains 的定语从句，that做主语，此处可以用which 或 that
答
that lay below是个定语从句，that为关系代词，作主语，整句修饰前面的mountains！供参考！
答
开始的时候,伯德跟他的队员们还是拍到了很多位于他们下面的山脉的照片的.
that lay below,做the mountains 的定语从句
that在从句中作主语,代替前面的the mountains.也可以换成which.