根据魔方格专家分析,试题“I saw some boys _______ soccer on the playground.[ ]A. are playing B. to play C. played D. playing …”主要考查了你对 【实义动词的现在分词】 等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。
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