单项选择题

（） in the United States, St. Louis has now become the 24th largest city.

A. Being the fourth biggest city
B. It was once the fourth biggest city
C. Once the fourth biggest city
D. The fourth biggest city it was

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

A. At
B. With
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He has never visited the town （） he was born.

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