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题型：单选题 题类：常考题 难易度：普通
牛津译林版2017-2018学年高一英语模块2Unit 1 Tales of the unexplained 同步练习（2）
—I'm afraid not. Some problems were not as easy as they________．
— I'd love to, but the question is _____it is worth doing.
A. until B. before C. since D. that
A. that B. which C. as D. what
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