PUT “DID, WAS OR WERE” INTO THE BRACKETS

3. - on_tap_tieng_anh_5_tu_3_den_6_thang_3
on_tap_tieng_anh_5_tu_3_den_6_thang_3
3. ...are you talking to? – I am talking to my friend, Thanh. a. Who b. Which c. When d. What