◎ 题干
Both the police and the workmen were grateful to the student for _______ in advance.  
[     ]
A. they had been informed this    
B. their informing of this
C. informing them of this        
D. having informed them this
◎ 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“Both the police and the workmen were grateful to the student for _______ in advance. [ ]A. they had been informed thisB. their informing of thisC. informing …”主要考查了你对  【动词短语】【动名词】  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。