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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单项选择题
Since it is too late to change my mind now, I am______ to carrying out the plan.
A．obliged
B．committed
C．engaged
D．resolved
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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