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、at what
D、in that

答案A

解析 situation通常与介词in搭配使用,关系代词which代替先行词situation,故A与本题相符。
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