【题目】The little girl was determined to become a doctor and her persistence eventually .
A. paid backB. paid for
C. paid inD. paid off
在线课程【答案】D
【解析】
考查动词短语辨析。句意：小女孩决心成为一名医生，她的坚持最终得到了回报。A. paid back还击；B. paid for为……付出代价；C. paid in 已缴；实缴；D. paid off得到了回报；见成效。根据句意可知选D。