As he was about to go out to search for Mary, she happened ____.
A．to coming in
B．to come in
C．came in
D．to have come in
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◎ 解析
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◎ 知识点
根据魔方格专家分析，试题“As he was about to go out to search for Mary, she happened ____. A．to coming inB．to come inC．came inD．to have come in…”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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