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【英语模拟题】
16. Government reports, examination compositions, legal documents and most business letters are the main situations ______ formal language is used.
A. in which B. on which C. in that D. at what
17. Reporting news and information used to be a task ______ almost exclusively for the news media.
A. applied B. traded C. substituted D. reserved
18. You need to find reliable information to make ______ investment choices.
A. sensitive B. sure C. steady D. sound
