◎ 题干
-The police have been           the area for quite a long time.    
-I've also noticed that. What have they been           ?   
[     ]
A. searching; searching    
B. searching for; searching    
C. searching for; searching for    
D. searching ; searching for
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“-The police have been the area for quite a long time.-I've also noticed that. What have they been ?[ ]A. searching; searchingB. searching for; searchingC…”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。