12.With that trust ____ to serve all Americans and I will do my best to fulfill that duty every day as your President.

A.coming a duty    B. which comes a duty    C. comes a duty     D. a duty came

【解析】C：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.