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13. No matter how many adults use the language，________it isn’t passed to the next generation, it cannot survive. A. if B. even though C. as D. as far as 解析 句意是：不管有多少成年人使用一种语言，如果不传给下一代人，这种语言就不会存在下去。从句是主句发生的条件，故用if引导。even though“即使”；as“由于”；as far as“至于……来说”。 答案 A 14. Talking about his success, the famous scientist said, “ I’ve been lucky________there are many people who have helped me.” A. provided that B. now that C. so that D. in that 解析 句意是：谈起了他的成功，这位著名科学家说，“我很幸运，有那么多的人帮助了我。”此句要用in that表示“在……方面”。 答案 D 15．________， she falls behind most of her classmates. A. Hard she works B. She works hard C. Hard does she work D. Hard as she works 解析 句意是：她尽管工作努力，但还是落后于她的同学们。as引导让步状语从句，要用倒装语序，Hard提到as前面。 答案 D 16. She was so angry that she rushed out into the rain________I could stop her. A. until B. before C. after D. as 解析 句意是：她是那样的生气，以至于我还没有时间拦住她，她就冲到外面的雨中了。此句要用before引导时间状语从句，before与could连用，常表示“还没有来得及……”。 答案 B | 
