单选题_______,IlostheartinFrenchlearnin

单选题 _______ , I lost heart in French learning，but my father often said to me, “Keep on workinghard；you will succeed ______ ”．A.At a time；in timeB.At a time：on timeC.At one time；in timeD.At one time；on time

C解析考查固定短语，at a time意思“每次；依次”；in time意思“及时”； on time意思“按时”，根据意思，可知选C

这个问题的回答的对