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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The old lady spent a week ______ for her little daughter's wedding.
A．messing up
B．messing around
C．stitching up
D．slacking up
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The discovery of the gold in the west ______ the exploration and settlement of Californi
A． kept track ofB. shied away fromC. gave birth toD. came up with
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