I HAVE SENT YOU A LOT OF LETTERS BUT YOU HAVE NEVER BEEN...A. RESPO...

14. - BAI TAP TRAC NGHIEM TONG HOP A9
BAI TAP TRAC NGHIEM TONG HOP A9

14.I have sent you a lot of letters but you have

never been...

a. response b. respond c.

responsive d. responsively