◎ 题干
_____, this physics problem seemed    simple, but when I tried to work it out, I   just couldn't.    
[     ]
A. On one hand      
B. In my opinion    
C. At first sight      
D. On its own
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“_____, this physics problem seemedsimple, but when I tried to work it out, I just couldn't. [ ]A. On one handB. In my opinion C. At first sight D. On its o…”主要考查了你对  【介词和介词短语】  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。