Chọn phương án đúngCâu hỏi Detective: I'm afraid I must ask both of you. What _____ at 10.20 p.m yesterday? Mr. X: I _____ chess with my wife. - Mr. Y: I _____ to a play on the radio. A. were you doing; am playing; was listening B. did you do; played; listened C. were you doing; am playing; am listening D. were you doing; was playing; was listening