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2017高考英语：二轮单项选择+特殊句式专练（答案、解析） 第******套 46. If you can make the teachers teach yours, you’ll make rapid progress. A. that B. what C which D. who 47. ____ only 20 minutes to go before the train left, I felt uneasy in the taxi to the railway station. ? A. For B. With C. As D. Because 48. AIDS is said__________the biggest health challenge to both men and women in that area next few years. ?A．that it is B．to be C．that it has been D．to have been 49. --- An ant has two stomachs --- one for itself, one for others. --- Really? Quite interesting. I ____ anything about it. A. don’t know B. have known C. haven’t known D. didn’t know 50. How long do you think it will be ________ the computer company puts forward a new product? A. before??? B. since??? C. until??? D. that 51. ---Would you like a cigarette ? ---sorry, It’s weeks I smoked A before | 
