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题型:单选题 题类:模拟题 难易度:普通

江苏省苏州市太仓市2019届九年级英语教学质量调研试卷

Modern science has found that        one is using chopsticks, over 30 joints and over 50 muscles(肌肉)are used.
A、while B、since C、although D、unless
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