单项选择题

I ______ this book in a secondhand bookstore on Nanjing Road.

A. came into
B. came about
C. came round
D. came across
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There ought to be less anxiety over the perceived risk of mountain climbing than ______ in the public mind today.
A. exists
B. exist
C. exiting
D. to exist
单项选择题
Because of the unexpected changes, they postponed ______ us an answer.
A. giving
B. have given
C. to give
D. to have given
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