WHEN DID THEY BUY THIS HOUSE

21. - KIEM TRA 45 12CB BAI1 21. - KIEM TRA 45 12CB BAI1
KIEM TRA 45 12CB BAI1

21. When did they buy this house?

A. How long have they bought this house? B. How long have they lived in this house?

C. Since when did they live in this house? D. How long did they live in this house/