—I have been waiting for you so long. —Sorry, I have been in the library, _______ my friend look for some books.A．helpedB．helpingC．to helpD．help-高中英语-n多题

◎ 题干

—I have been waiting for you so long.
—Sorry, I have been in the library, _______ my friend look for some books.

A．helped

B．helping

C．to help

D．help

◎ 答案

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“—I have been waiting for you so long. —Sorry, I have been in the library, _______ my friend look for some books.A．helpedB．helpingC．to helpD．help…”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。

◎ 相似题

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