单项选择题

That was an era when many Americans felt it was their ______ duty to support the war.

A．authentic
B．ethnic
C．eccentric
D．patriotic
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单项选择题
Guidelines should be ______ for dealing with the abrupt emergencies.
A．drew on
B．drew in
C．drew up
D．drew down
单项选择题
Fighting in Vietnam was an experience that would ______ him for the rest of his life.
A．dismay
B．donate
C．ensue
D．haunt
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