◎ 题干
Though the math problem is very difficult, the smart boy ______ it ______at last.        
[     ]
A. looked; out        
B. worked; out    
C. thought; of    
D. put; up
◎ 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“Though the math problem is very difficult, the smart boy ______ it ______at last.[ ]A. looked; outB. worked; out C. thought; of D. put; 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。