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【单选题】
What does "this endeavor"in "the energy, the faith, the devotion which we bring to this endeavor will light our country and all who serve it" refer to?A.
Assuring a more fruitful life for all mankind
B.
Serving the country by doing whatever it asks
C.
d efending freedom when there is danger of losing it
D.
Forging a global alliance against the common enemies
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