AIDS is said _______ the biggest health challenge to both men and women in that area over the past few years.
A．that it is
B．to be
C．that it has been
D．to have been
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◎ 知识点
根据n多题专家分析，试题“AIDS is said _______ the biggest health challenge to both men and women in that area over the past few years.A．that it isB．to beC．that it has beenD．to have been…”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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