2. 外语
  3. Government reports, examination compositions, legal documents and most business letters are the main situations______formal lang

Government reports, examination compositions, legal documents and most business letters are the main situations______formal lang

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问题 Government reports, examination compositions, legal documents and most business letters are the main situations______formal language is used.
选项 A、in which
B、on which
C、in that
D、at what
答案A
解析 定语从句。先行词与从句的关联是in the main situations，关系代词which代替先行词，故选A。
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