◎ 题干
The clerk________his letter is working in our company.
[     ]
A.referred  
B.referred to
C.referred to in  
D.referred in
◎ 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 clerk________his letter is working in our company.[ ] A.referredB.referred toC.referred to inD.referred in…”主要考查了你对  【介词和介词短语】【过去分词】  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。