With that trust ____ to serve all Americans and I will do my best to fulfill that duty every day as your President.
A.ing a duty
B.which es a duty
C.es a duty
D.a duty came
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C解析：本句考查状语提前后，句子的语序问题。如状语提前，且句子主语不为人称代词，此时句子主语、谓语完全倒装，类似于In the front hangs a portrait.【标签】倒装结构