◎ 题干
I'm still working          the problem. But I think I can work it            soon.   
[     ]
A. on; on                
B. on; out    
C. out; at                
D. at; at
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I'm still workingthe problem. But I think I can work itsoon.[ ]A. on; onB. on; outC. out; atD. at; at…”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。