The boy was seen ___ his bikecycle while riding in the street.
A．to fall off
B．fall off
C．to jump off
D．jump off
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◎ 解析
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◎ 知识点
根据n多题专家分析，试题“The boy was seen ___ his bikecycle while riding in the street.A．to fall offB．fall offC．to jump offD．jump off…”主要考查了你对 【现在分词的被动式】，【现在分词】，【不定式的被动式】，【过去分词】 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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