◎ 题干
In writing a composition, there must not be one sentence or even one word which is brought in ______.
 [     ]
A. at random        
B. at ease          
C. on purpose  
D. at times
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“In writing a composition, there must not be one sentence or even one word which is brought in ______.[ ]A. at random B. at easeC. on purpose D. at times…”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。