__ carefully if any change occurs when doing experiments in the lab..A．ObserveB．To observeC．ObservedD．Observing-高中英语-n多题

◎ 题干

__ carefully if any change occurs when doing experiments in the lab..

A．Observe	B．To observe
C．Observed	D．Observing

◎ 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“__ carefully if any change occurs when doing experiments in the lab..A．ObserveB．To observeC．ObservedD．Observing…”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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