单项选择题

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
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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
单项选择题
America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
A. could
B. was
C. would
D. did
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