Up to now, our society ________ with limited living space and a shortage of natural resources.A．has been challengedB．is being challengedC．is challengingD．has c-高中英语-魔方格

◎ 题干

Up to now, our society ________ with limited living space and a shortage of natural resources.

A．has been challenged	B．is being challenged
C．is challenging	D．has challenged

◎ 答案

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◎ 解析

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◎ 知识点

根据魔方格专家分析，试题“ Up to now, our society ________ with limited living space and a shortage of natural resources.A．has been challengedB．is being challengedC．is challengingD．has c…”主要考查了你对【现在完成时】，【现在完成时的被动语态】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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