问题
_______ , 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
B:At a time, on time
C:At one time, in time
D:At one time, on time
正确答案是：
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