【题目】It seemed an impossible task, but Tom, though physically challenged, carried on until it was completely fulfilled.
A. instead B. yet
C. regardless D. still
在线课程【答案】C
【解析】句意：这好像是不可能的任务，但是汤姆，尽管是体能挑战，不管怎样继续下去直到彻底完成。instead相反；yet还；regardless不管怎样；still仍然。故选C。