单项选择题

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

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。

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