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Things have changed a lot ____ I wrote to you last time.

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

Things have changed a lot ____ I wrote to you last time.

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

Things have changed a lot ____ I wrote to you last time.

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

Things have changed a lot ____ I wrote to you last time.

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

Things have changed a lot ____ I wrote to you last time.

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