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题型：单选题 题类：常考题 难易度：普通
冀教版初中英语七年级下册Unit 1 Lesson 1 A trip to China同步练习
— That's true. Nobody can learn it well _______ he works hard at it.
—I think it is enjoyable, I sometimes have some trouble in study.
—He seems to have a cold ___________the weather changes suddenly.
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