_______ , 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
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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