◎ 题干
To make himself________, the old professor had to______his voice.
[      ]
A. hear; raised  
B. heard; raise
C. heard; rise  
D. heard; raised
◎ 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“To make himself________, the old professor had to______his voice.[ ]A. hear; raisedB. heard; raiseC. heard; riseD. heard; raised…”主要考查了你对  【动词】【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。