Background information: simple present /present continuous/present perfect 背景信息:一般现在时/现在进行时/现在完成时 Research activity/Purpose: simple past/present perfect 研究活动/目的:一般过去时/现在完成时 Methods: simple past tense (active or passive) 方法:一般过去时(主动或被动) Results: simple p...
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for generations, artists have chosen and trusted the derwent brand for art materials the world over. our time honoured skills, modern manufacturing methods and quality control enable us to create the world's largest range of fine art pencils with unique brands such as inktense, coloursoft, ...