问题补充：
, I lost heart in English learning, but my teacher often said to me, “Keep on working hard and you’ll succeed”.
A. At a time, in time
B. At a time, on time
C. At one time, in time
D. At one time, on time
答案：
A. At a time, in time
B. At a time, on time
(答案→)C. At one time, in time
D. At one time, on time
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