题目

 —Who is the old man talking with your teacher?    —I don’t know. I _________ him before. A. was never seeing                                   B. had never seen C. never saw                                         D. wouldn’t see 答案：C before表示要用过去时，意为“我以前从未见过他”可排除B、A，并根据上下文语境，排除D。在横线上填“〈” “〉”或“=”。7+6____12 9-9____18 16-10____7 12+0____12-0 9____13-4 8+4____12 5+9____11 11-5____5