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动词-ing形式作定语与状语 — 英语填空题

北师大版·英语 UNIT 3 CONSERVATION AI 三重审校通过

题目
用括号内动词的-ing形式填空:By ___ (reuse) glass jars during the project, the students reduced plastic waste. The jars ___ (hold) young seedlings were then placed in the school garden.