◎ 题干
—Did he work out the math problem?        
—No, he thought hard, but could not ______ with a proper answer.
[     ]
A. put up    
B. turn up    
C. show up    
D. come up
◎ 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“—Did he work out the math problem? —No, he thought hard, but could not ______ with a proper answer.[ ]A. put up B. turn up C. show up D. come up…”主要考查了你对  【动词短语】  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。