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9. We must do our best to develop science and technology,it        in the national economy (part)

我们必须尽全力发展科技,它对国家的经济发展起着重要作用。

9. playing an important part题干中逗号表明其后不应为一个简单句,而是一个独立结构。

题目来源:高考英语组合训练多项选择+完成句子 > 组合训练19-20

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