Usually a space is left between the rails of a railway line

Usually a space is left between the rails of a railway line .( ) one piece
usually a space is left between the rails of a railway line ( )one piece joins the next.
a when b where c so that d as
及其翻译

xx破碎风飘絮 1年前已收到1个回答举报

km2008 幼苗

共回答了22个问题采纳率：90.9% 举报

A;
意思：在架一个接一个的铁轨的时候,两个铁轨中间要留一定的空隙；
排除法比较容易；
文中已经有地点(between the rails of a railway line), 所以不用where
c表示以便,所以.. d表示作为...
排除掉 bcd,语境都不合适；

1年前

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