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
Although Asian countries are generally more ______in social customs than Western countries, there have been several notable examples of women leaders in both China and Indi
A． conservativeB. confidentialC. comprehensiveD. consistent
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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