◎ 题干
Once a reporter receives his assignment from the chief-editor, he has to ______ on his work and tries his best to work on it until the chief-editor ______ it.  
[     ]
A. fix his attention; approves  
B. focus; proves of  
C. concentrate; approves of  
D. get down; approves
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Once a reporter receives his assignment from the chief-editor, he has to ______ on his work and tries his best to work on it until the chief-editor ______ it.[ …”主要考查了你对  【动词短语】【动词】  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。