　　　theyarrivedearlyatthattrainstation,theynearlymissedt...

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they arrived early at that train station, they nearly missed their train.

A. Unless B. Although C. Because D. If

B。考查连词辨析。句意: 虽然他们到那个火车站很早, 他们差点错过了火车。连词although引导让步状语从句。