◎ 题干
They have started an investigation, ________ are being kept secret.

[     ]

A. details of which
B. of which the details
C. and the detail
D. the details of it
◎ 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“They have started an investigation, ________ are being kept secret. [ ]A. details of which B. of which the details C. and the detail D. the details of it …”主要考查了你对  【关系代词】【介词和介词短语】【非限制性定语从句】  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。