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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