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We arrived at the station ____ the train had left.

A. after            B. before          C. since          D. when

We arrived at the station ____ the train had left.

A. after            B. before          C. since          D. when

We arrived at the station ____ the train had left.

A. after            B. before          C. since          D. when

We arrived at the station ____ the train had left.

A. after            B. before          C. since          D. when

We arrived at the station ____ the train had left.

A. after            B. before          C. since          D. when