Government reports, examination compositions, legal documents and most business letters are the main situations ________ formal language is use; A. in which B. on which C. at what D. in that

Government reports, examination compositions, legal documents and most business letters are the main situations ________ formal language is use;
A. in which
B. on which
C. at what
D. in that

出自：兰州大学大学英语（4）课程作业

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