SIX YEARS AGO WE STARTED WRITING TO EACH OTHERA.WE’VE BEEN WRITING...

42. Six years ago we started writing to each other

A.

We’ve been writing to each other for six years.

B. We’ve been writing to each other since six years.

C. We’re used to write to each other for six years.

D. We used to write to each other for six years.