It is really a challenge for me to finish it. In order not to be disturbed, I spent three days ______ in my study surfing the internet to do the research.
A．locking
B．locked
C．to lock
D．lock
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◎ 解析
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◎ 知识点
根据n多题专家分析，试题“It is really a challenge for me to finish it. In order not to be disturbed, I spent three days ______ in my study surfing the internet to do the research.A．loc…”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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