单项选择题

（） my return, I learned that Professor Smith had been at the Museum and would not be back for several hours.

A. At
B. With
C. On
D. During

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He has never visited the town （） he was born.

A. where
B. which
C. on which
D. that

单项选择题

Government reports, examination compositions, legal documents and most business letters are the main situations （） formal language is used.

A. in which
B. at what
C. on which
D. in that

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