_____ back problems， always bend your knees when you lift heavy objects. A．AvoidingB．To avoid C．Having avoidedD．To be avoiding-高中英语-n多题

◎ 题干

_____ back problems， always bend your knees when you lift heavy objects.

A．Avoiding	B．To avoid
C．Having avoided	D．To be avoiding

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“_____ back problems， always bend your knees when you lift heavy objects. A．AvoidingB．To avoid C．Having avoidedD．To be avoiding…”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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