UNIT 1 TO UNIT 3I. HÃY CHỌN MỘT TỪ CÓ PHẦN GẠCH DƯỚI ĐƯỢC PHÁT ÂM KHÁC...

17. While we _________ on the phone, the power _________ out.

A. talked - went B. were talking – was going

C. were talking –went D. talked – was going