Once these were solved, the railroad was established as the best means of land transportation.

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问题 Once these were solved, the railroad was established as the best means of land transportation.

选项 A、这些问题一旦得到解决，铁路将成为最佳的陆上运输手段。
B、一旦解决了问题，这条铁路将是最好的陆上交通工具。
C、问题一次性解决，我们将建设一条最好的铁路用于陆上交通。
D、这些问题一旦得到解决，铁路将建成为陆上运输的最好方式。

答案A

解析 once意为"一旦"。land transportation意为"陆上运输"。

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大学英语三级B级

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