A;
意思：在架一個(gè)接一個(gè)的鐵軌的時(shí)候,兩個(gè)鐵軌中間要留一定的空隙；
排除法比較容易；
文中已經(jīng)有地點(diǎn)(between the rails of a railway line), 所以不用where
c表示 以便,所以.. d表示 作為...
排除掉 bcd,語境都不合適；
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
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
及其翻譯
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
及其翻譯
英語人氣：973 ℃時(shí)間：2020-05-22 16:42:57
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