A. since
B. for
C. from
D. in
Past perfect continuous tense is used when a work is being continued for some time from the past. have been teasing is past perfect continuous and for is the correct preposition to be used.
A. since
B. for
C. from
D. in
Past perfect continuous tense is used when a work is being continued for some time from the past. have been teasing is past perfect continuous and for is the correct preposition to be used.